[syzbot] [mm?] possible deadlock in hugetlb_vma_lock_read
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syzbot
Oct 9, 2025, 1:30:31 PM (11 hours ago) Oct 9
to ak...@linux-foundation.org, da...@redhat.com, linux-...@vger.kernel.org, linu...@kvack.org, muchu...@linux.dev, osal...@suse.de, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: fd94619c4336 Merge tag 'zonefs-6.18-rc1' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=134b9a7c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=5b33053d3e8155ed
dashboard link: https://syzkaller.appspot.com/bug?extid=1ad78f6a1785a2fceb88
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5e204fe6bdd8/disk-fd94619c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5e94719fef3e/vmlinux-fd94619c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1ec4d60a3bf9/bzImage-fd94619c.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1ad78f...@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.3156/19232 is trying to acquire lock:
ffff8880721c60e8 (&resv_map->rw_sema){++++}-{4:4}, at: hugetlb_vma_lock_read mm/hugetlb.c:305 [inline]
ffff8880721c60e8 (&resv_map->rw_sema){++++}-{4:4}, at: hugetlb_vma_lock_read+0xff/0x130 mm/hugetlb.c:296
but task is already holding lock:
ffff888143ea6728 (&hugetlb_fault_mutex_table[i]){+.+.}-{4:4}, at: hugetlb_fault+0x302/0x2f40 mm/hugetlb.c:6699
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #8 (&hugetlb_fault_mutex_table[i]){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:598 [inline]
__mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760
hugetlb_fault+0x302/0x2f40 mm/hugetlb.c:6699
handle_mm_fault+0xbfa/0xd10 mm/memory.c:6485
do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:68
copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
_inline_copy_from_user include/linux/uaccess.h:178 [inline]
_copy_from_user+0x98/0xd0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
csum_and_copy_from_user include/net/checksum.h:31 [inline]
copy_from_user_iter_csum net/core/skbuff.c:7328 [inline]
iterate_ubuf include/linux/iov_iter.h:30 [inline]
iterate_and_advance2 include/linux/iov_iter.h:302 [inline]
csum_and_copy_from_iter_full+0x21a/0x1f90 net/core/skbuff.c:7340
ip_generic_getfrag+0x170/0x270 net/ipv4/ip_output.c:942
raw_getfrag+0x22d/0x2a0 net/ipv4/raw.c:479
__ip_append_data+0x34ec/0x41a0 net/ipv4/ip_output.c:1172
ip_append_data net/ipv4/ip_output.c:1378 [inline]
ip_append_data+0x10f/0x1a0 net/ipv4/ip_output.c:1357
raw_sendmsg+0xeee/0x38b0 net/ipv4/raw.c:651
inet_sendmsg+0x119/0x140 net/ipv4/af_inet.c:853
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0x973/0xc70 net/socket.c:2630
___sys_sendmsg+0x134/0x1d0 net/socket.c:2684
__sys_sendmmsg+0x200/0x420 net/socket.c:2773
__do_sys_sendmmsg net/socket.c:2800 [inline]
__se_sys_sendmmsg net/socket.c:2797 [inline]
__x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2797
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #7 (sk_lock-AF_INET){+.+.}-{0:0}:
lock_sock_nested+0x41/0xf0 net/core/sock.c:3720
lock_sock include/net/sock.h:1679 [inline]
inet_shutdown+0x67/0x440 net/ipv4/af_inet.c:907
nbd_mark_nsock_dead+0xae/0x5d0 drivers/block/nbd.c:318
recv_work+0x671/0xa80 drivers/block/nbd.c:1018
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3263
process_scheduled_works kernel/workqueue.c:3346 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #6 (&nsock->tx_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:598 [inline]
__mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760
nbd_handle_cmd drivers/block/nbd.c:1140 [inline]
nbd_queue_rq+0x423/0x12d0 drivers/block/nbd.c:1204
blk_mq_dispatch_rq_list+0x413/0x1e20 block/blk-mq.c:2129
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xcb7/0x15f0 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd8/0x1b0 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x239/0x670 block/blk-mq.c:2367
blk_mq_dispatch_list+0x514/0x1310 block/blk-mq.c:2928
blk_mq_flush_plug_list block/blk-mq.c:2976 [inline]
blk_mq_flush_plug_list+0x130/0x600 block/blk-mq.c:2948
__blk_flush_plug+0x2c4/0x4b0 block/blk-core.c:1225
blk_finish_plug block/blk-core.c:1252 [inline]
blk_finish_plug block/blk-core.c:1249 [inline]
__submit_bio+0x545/0x690 block/blk-core.c:651
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x53d/0xc10 block/blk-core.c:755
submit_bio_noacct+0xbbb/0x1f60 block/blk-core.c:879
submit_bh fs/buffer.c:2829 [inline]
block_read_full_folio+0x4db/0x850 fs/buffer.c:2461
filemap_read_folio+0xc5/0x2a0 mm/filemap.c:2444
do_read_cache_folio+0x263/0x5c0 mm/filemap.c:4024
read_mapping_folio include/linux/pagemap.h:999 [inline]
read_part_sector+0xd4/0x370 block/partitions/core.c:722
adfspart_check_ICS+0x93/0x940 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x723/0x1520 block/partitions/core.c:693
blkdev_get_whole+0x187/0x290 block/bdev.c:748
bdev_open+0x2c7/0xe40 block/bdev.c:957
blkdev_open+0x34e/0x4f0 block/fops.c:694
do_dentry_open+0x982/0x1530 fs/open.c:965
vfs_open+0x82/0x3f0 fs/open.c:1097
do_open fs/namei.c:3975 [inline]
path_openat+0x1de4/0x2cb0 fs/namei.c:4134
do_filp_open+0x20b/0x470 fs/namei.c:4161
do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #5 (&cmd->lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:598 [inline]
__mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760
nbd_queue_rq+0xbd/0x12d0 drivers/block/nbd.c:1196
blk_mq_dispatch_rq_list+0x413/0x1e20 block/blk-mq.c:2129
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xcb7/0x15f0 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd8/0x1b0 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x239/0x670 block/blk-mq.c:2367
blk_mq_dispatch_list+0x514/0x1310 block/blk-mq.c:2928
blk_mq_flush_plug_list block/blk-mq.c:2976 [inline]
blk_mq_flush_plug_list+0x130/0x600 block/blk-mq.c:2948
__blk_flush_plug+0x2c4/0x4b0 block/blk-core.c:1225
blk_finish_plug block/blk-core.c:1252 [inline]
blk_finish_plug block/blk-core.c:1249 [inline]
__submit_bio+0x545/0x690 block/blk-core.c:651
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x53d/0xc10 block/blk-core.c:755
submit_bio_noacct+0xbbb/0x1f60 block/blk-core.c:879
submit_bh fs/buffer.c:2829 [inline]
block_read_full_folio+0x4db/0x850 fs/buffer.c:2461
filemap_read_folio+0xc5/0x2a0 mm/filemap.c:2444
do_read_cache_folio+0x263/0x5c0 mm/filemap.c:4024
read_mapping_folio include/linux/pagemap.h:999 [inline]
read_part_sector+0xd4/0x370 block/partitions/core.c:722
adfspart_check_ICS+0x93/0x940 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x723/0x1520 block/partitions/core.c:693
blkdev_get_whole+0x187/0x290 block/bdev.c:748
bdev_open+0x2c7/0xe40 block/bdev.c:957
blkdev_open+0x34e/0x4f0 block/fops.c:694
do_dentry_open+0x982/0x1530 fs/open.c:965
vfs_open+0x82/0x3f0 fs/open.c:1097
do_open fs/namei.c:3975 [inline]
path_openat+0x1de4/0x2cb0 fs/namei.c:4134
do_filp_open+0x20b/0x470 fs/namei.c:4161
do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #4 (set->srcu){.+.+}-{0:0}:
srcu_lock_sync include/linux/srcu.h:173 [inline]
__synchronize_srcu+0xa1/0x290 kernel/rcu/srcutree.c:1439
blk_mq_wait_quiesce_done block/blk-mq.c:283 [inline]
blk_mq_wait_quiesce_done block/blk-mq.c:280 [inline]
blk_mq_quiesce_queue block/blk-mq.c:303 [inline]
blk_mq_quiesce_queue+0x149/0x1b0 block/blk-mq.c:298
elevator_switch+0x17d/0x810 block/elevator.c:588
elevator_change+0x391/0x5d0 block/elevator.c:691
elevator_set_default+0x2e9/0x380 block/elevator.c:767
blk_register_queue+0x384/0x4e0 block/blk-sysfs.c:942
__add_disk+0x74a/0xf00 block/genhd.c:528
add_disk_fwnode+0x13f/0x5d0 block/genhd.c:597
add_disk include/linux/blkdev.h:775 [inline]
nbd_dev_add+0x783/0xbb0 drivers/block/nbd.c:1981
nbd_init+0x181/0x320 drivers/block/nbd.c:2688
do_one_initcall+0x120/0x6e0 init/main.c:1283
do_initcall_level init/main.c:1345 [inline]
do_initcalls init/main.c:1361 [inline]
do_basic_setup init/main.c:1380 [inline]
kernel_init_freeable+0x5c2/0x910 init/main.c:1593
kernel_init+0x1c/0x2b0 init/main.c:1483
ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #3 (&q->elevator_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:598 [inline]
__mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760
elevator_change+0x17d/0x5d0 block/elevator.c:689
elv_iosched_store+0x315/0x3c0 block/elevator.c:824
queue_attr_store+0x268/0x310 block/blk-sysfs.c:869
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142
kernfs_fop_write_iter+0x3af/0x570 fs/kernfs/file.c:352
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x7d3/0x11d0 fs/read_write.c:686
ksys_write+0x12a/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&q->q_usage_counter(io)#62){++++}-{0:0}:
blk_alloc_queue+0x619/0x760 block/blk-core.c:461
blk_mq_alloc_queue+0x172/0x280 block/blk-mq.c:4399
__blk_mq_alloc_disk+0x29/0x120 block/blk-mq.c:4446
nbd_dev_add+0x492/0xbb0 drivers/block/nbd.c:1951
nbd_init+0x181/0x320 drivers/block/nbd.c:2688
do_one_initcall+0x120/0x6e0 init/main.c:1283
do_initcall_level init/main.c:1345 [inline]
do_initcalls init/main.c:1361 [inline]
do_basic_setup init/main.c:1380 [inline]
kernel_init_freeable+0x5c2/0x910 init/main.c:1593
kernel_init+0x1c/0x2b0 init/main.c:1483
ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #1 (fs_reclaim){+.+.}-{0:0}:
__fs_reclaim_acquire mm/page_alloc.c:4269 [inline]
fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:4283
might_alloc include/linux/sched/mm.h:318 [inline]
prepare_alloc_pages+0x162/0x610 mm/page_alloc.c:4951
__alloc_frozen_pages_noprof+0x18b/0x2470 mm/page_alloc.c:5172
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2507
pagetable_alloc_noprof include/linux/mm.h:2975 [inline]
pmd_alloc_one_noprof include/asm-generic/pgalloc.h:142 [inline]
__pmd_alloc+0x3b/0x8b0 mm/memory.c:6573
pmd_alloc include/linux/mm.h:2932 [inline]
huge_pte_alloc+0x41d/0x5b0 mm/hugetlb.c:7682
hugetlb_fault+0x373/0x2f40 mm/hugetlb.c:6707
handle_mm_fault+0xbfa/0xd10 mm/memory.c:6485
do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]
strncpy_from_user+0x147/0x2e0 lib/strncpy_from_user.c:130
getname_flags.part.0+0x8f/0x550 fs/namei.c:157
getname_flags+0x93/0xf0 include/linux/audit.h:345
getname include/linux/fs.h:2921 [inline]
do_sys_openat2+0xb8/0x1d0 fs/open.c:1431
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&resv_map->rw_sema){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
down_read+0x9b/0x480 kernel/locking/rwsem.c:1537
hugetlb_vma_lock_read mm/hugetlb.c:305 [inline]
hugetlb_vma_lock_read+0xff/0x130 mm/hugetlb.c:296
hugetlb_fault+0x30a/0x2f40 mm/hugetlb.c:6706
handle_mm_fault+0xbfa/0xd10 mm/memory.c:6485
do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
rep_movs_alternative+0x30/0x90 arch/x86/lib/copy_user_64.S:53
copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
_inline_copy_from_user include/linux/uaccess.h:178 [inline]
_copy_from_user+0x98/0xd0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
user_termios_to_kernel_termios+0x21/0x30 drivers/tty/tty_ioctl.c:398
set_termios+0x233/0x880 drivers/tty/tty_ioctl.c:467
tty_mode_ioctl+0xbd8/0xd30 drivers/tty/tty_ioctl.c:826
n_tty_ioctl_helper+0x4b/0x2b0 drivers/tty/tty_ioctl.c:982
n_tty_ioctl+0x7f/0x370 drivers/tty/n_tty.c:2509
tty_ioctl+0x6fd/0x1680 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&resv_map->rw_sema --> sk_lock-AF_INET --> &hugetlb_fault_mutex_table[i]
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&hugetlb_fault_mutex_table[i]);
lock(sk_lock-AF_INET);
lock(&hugetlb_fault_mutex_table[i]);
rlock(&resv_map->rw_sema);
*** DEADLOCK ***
3 locks held by syz.0.3156/19232:
#0: ffff88806262b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffff88807daf01e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:387 [inline]
#1: ffff88807daf01e0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:368 [inline]
#1: ffff88807daf01e0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x35/0x6e0 mm/mmap_lock.c:428
#2: ffff888143ea6728 (&hugetlb_fault_mutex_table[i]){+.+.}-{4:4}, at: hugetlb_fault+0x302/0x2f40 mm/hugetlb.c:6699
stack backtrace:
CPU: 0 UID: 0 PID: 19232 Comm: syz.0.3156 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043
check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
down_read+0x9b/0x480 kernel/locking/rwsem.c:1537
hugetlb_vma_lock_read mm/hugetlb.c:305 [inline]
hugetlb_vma_lock_read+0xff/0x130 mm/hugetlb.c:296
hugetlb_fault+0x30a/0x2f40 mm/hugetlb.c:6706
handle_mm_fault+0xbfa/0xd10 mm/memory.c:6485
do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x30/0x90 arch/x86/lib/copy_user_64.S:60
Code: 83 f9 08 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 e9 cd 23 04 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <48> 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08
RSP: 0018:ffffc9000e307a08 EFLAGS: 00050206
RAX: 0000000000000001 RBX: 0000000000000038 RCX: 000000000000002c
RDX: fffff52001c60f63 RSI: 0000000000000038 RDI: ffffc9000e307af0
RBP: 000000000000002c R08: 0000000000000001 R09: fffff52001c60f63
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc9000e307af0 R14: ffffc9000e307af0 R15: dffffc0000000000
copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
_inline_copy_from_user include/linux/uaccess.h:178 [inline]
_copy_from_user+0x98/0xd0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
user_termios_to_kernel_termios+0x21/0x30 drivers/tty/tty_ioctl.c:398
set_termios+0x233/0x880 drivers/tty/tty_ioctl.c:467
tty_mode_ioctl+0xbd8/0xd30 drivers/tty/tty_ioctl.c:826
n_tty_ioctl_helper+0x4b/0x2b0 drivers/tty/tty_ioctl.c:982
n_tty_ioctl+0x7f/0x370 drivers/tty/n_tty.c:2509
tty_ioctl+0x6fd/0x1680 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f733818eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7339054038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f73383e5fa0 RCX: 00007f733818eec9
RDX: 0000000000000038 RSI: 00000000402c542b RDI: 0000000000000003
RBP: 00007f7338211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f73383e6038 R14: 00007f73383e5fa0 R15: 00007fff2c7f4708
</TASK>
----------------
Code disassembly (best guess):
0: 83 f9 08 cmp $0x8,%ecx
3: 73 25 jae 0x2a
5: 85 c9 test %ecx,%ecx
7: 74 0f je 0x18
9: 8a 06 mov (%rsi),%al
b: 88 07 mov %al,(%rdi)
d: 48 ff c7 inc %rdi
10: 48 ff c6 inc %rsi
13: 48 ff c9 dec %rcx
16: 75 f1 jne 0x9
18: e9 cd 23 04 00 jmp 0x423ea
1d: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1)
24: 00 00 00 00
28: 66 90 xchg %ax,%ax
* 2a: 48 8b 06 mov (%rsi),%rax <-- trapping instruction
2d: 48 89 07 mov %rax,(%rdi)
30: 48 83 c6 08 add $0x8,%rsi
34: 48 83 c7 08 add $0x8,%rdi
38: 83 e9 08 sub $0x8,%ecx
3b: 74 db je 0x18
3d: 83 f9 08 cmp $0x8,%ecx
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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#syz undup
syzbot found the following issue on:
HEAD commit: fd94619c4336 Merge tag 'zonefs-6.18-rc1' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=134b9a7c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=5b33053d3e8155ed
dashboard link: https://syzkaller.appspot.com/bug?extid=1ad78f6a1785a2fceb88
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5e204fe6bdd8/disk-fd94619c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5e94719fef3e/vmlinux-fd94619c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1ec4d60a3bf9/bzImage-fd94619c.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1ad78f...@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.3156/19232 is trying to acquire lock:
ffff8880721c60e8 (&resv_map->rw_sema){++++}-{4:4}, at: hugetlb_vma_lock_read mm/hugetlb.c:305 [inline]
ffff8880721c60e8 (&resv_map->rw_sema){++++}-{4:4}, at: hugetlb_vma_lock_read+0xff/0x130 mm/hugetlb.c:296
but task is already holding lock:
ffff888143ea6728 (&hugetlb_fault_mutex_table[i]){+.+.}-{4:4}, at: hugetlb_fault+0x302/0x2f40 mm/hugetlb.c:6699
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #8 (&hugetlb_fault_mutex_table[i]){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:598 [inline]
__mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760
hugetlb_fault+0x302/0x2f40 mm/hugetlb.c:6699
handle_mm_fault+0xbfa/0xd10 mm/memory.c:6485
do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:68
copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
_inline_copy_from_user include/linux/uaccess.h:178 [inline]
_copy_from_user+0x98/0xd0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
csum_and_copy_from_user include/net/checksum.h:31 [inline]
copy_from_user_iter_csum net/core/skbuff.c:7328 [inline]
iterate_ubuf include/linux/iov_iter.h:30 [inline]
iterate_and_advance2 include/linux/iov_iter.h:302 [inline]
csum_and_copy_from_iter_full+0x21a/0x1f90 net/core/skbuff.c:7340
ip_generic_getfrag+0x170/0x270 net/ipv4/ip_output.c:942
raw_getfrag+0x22d/0x2a0 net/ipv4/raw.c:479
__ip_append_data+0x34ec/0x41a0 net/ipv4/ip_output.c:1172
ip_append_data net/ipv4/ip_output.c:1378 [inline]
ip_append_data+0x10f/0x1a0 net/ipv4/ip_output.c:1357
raw_sendmsg+0xeee/0x38b0 net/ipv4/raw.c:651
inet_sendmsg+0x119/0x140 net/ipv4/af_inet.c:853
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0x973/0xc70 net/socket.c:2630
___sys_sendmsg+0x134/0x1d0 net/socket.c:2684
__sys_sendmmsg+0x200/0x420 net/socket.c:2773
__do_sys_sendmmsg net/socket.c:2800 [inline]
__se_sys_sendmmsg net/socket.c:2797 [inline]
__x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2797
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #7 (sk_lock-AF_INET){+.+.}-{0:0}:
lock_sock_nested+0x41/0xf0 net/core/sock.c:3720
lock_sock include/net/sock.h:1679 [inline]
inet_shutdown+0x67/0x440 net/ipv4/af_inet.c:907
nbd_mark_nsock_dead+0xae/0x5d0 drivers/block/nbd.c:318
recv_work+0x671/0xa80 drivers/block/nbd.c:1018
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3263
process_scheduled_works kernel/workqueue.c:3346 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #6 (&nsock->tx_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:598 [inline]
__mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760
nbd_handle_cmd drivers/block/nbd.c:1140 [inline]
nbd_queue_rq+0x423/0x12d0 drivers/block/nbd.c:1204
blk_mq_dispatch_rq_list+0x413/0x1e20 block/blk-mq.c:2129
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xcb7/0x15f0 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd8/0x1b0 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x239/0x670 block/blk-mq.c:2367
blk_mq_dispatch_list+0x514/0x1310 block/blk-mq.c:2928
blk_mq_flush_plug_list block/blk-mq.c:2976 [inline]
blk_mq_flush_plug_list+0x130/0x600 block/blk-mq.c:2948
__blk_flush_plug+0x2c4/0x4b0 block/blk-core.c:1225
blk_finish_plug block/blk-core.c:1252 [inline]
blk_finish_plug block/blk-core.c:1249 [inline]
__submit_bio+0x545/0x690 block/blk-core.c:651
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x53d/0xc10 block/blk-core.c:755
submit_bio_noacct+0xbbb/0x1f60 block/blk-core.c:879
submit_bh fs/buffer.c:2829 [inline]
block_read_full_folio+0x4db/0x850 fs/buffer.c:2461
filemap_read_folio+0xc5/0x2a0 mm/filemap.c:2444
do_read_cache_folio+0x263/0x5c0 mm/filemap.c:4024
read_mapping_folio include/linux/pagemap.h:999 [inline]
read_part_sector+0xd4/0x370 block/partitions/core.c:722
adfspart_check_ICS+0x93/0x940 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x723/0x1520 block/partitions/core.c:693
blkdev_get_whole+0x187/0x290 block/bdev.c:748
bdev_open+0x2c7/0xe40 block/bdev.c:957
blkdev_open+0x34e/0x4f0 block/fops.c:694
do_dentry_open+0x982/0x1530 fs/open.c:965
vfs_open+0x82/0x3f0 fs/open.c:1097
do_open fs/namei.c:3975 [inline]
path_openat+0x1de4/0x2cb0 fs/namei.c:4134
do_filp_open+0x20b/0x470 fs/namei.c:4161
do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #5 (&cmd->lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:598 [inline]
__mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760
nbd_queue_rq+0xbd/0x12d0 drivers/block/nbd.c:1196
blk_mq_dispatch_rq_list+0x413/0x1e20 block/blk-mq.c:2129
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xcb7/0x15f0 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd8/0x1b0 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x239/0x670 block/blk-mq.c:2367
blk_mq_dispatch_list+0x514/0x1310 block/blk-mq.c:2928
blk_mq_flush_plug_list block/blk-mq.c:2976 [inline]
blk_mq_flush_plug_list+0x130/0x600 block/blk-mq.c:2948
__blk_flush_plug+0x2c4/0x4b0 block/blk-core.c:1225
blk_finish_plug block/blk-core.c:1252 [inline]
blk_finish_plug block/blk-core.c:1249 [inline]
__submit_bio+0x545/0x690 block/blk-core.c:651
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x53d/0xc10 block/blk-core.c:755
submit_bio_noacct+0xbbb/0x1f60 block/blk-core.c:879
submit_bh fs/buffer.c:2829 [inline]
block_read_full_folio+0x4db/0x850 fs/buffer.c:2461
filemap_read_folio+0xc5/0x2a0 mm/filemap.c:2444
do_read_cache_folio+0x263/0x5c0 mm/filemap.c:4024
read_mapping_folio include/linux/pagemap.h:999 [inline]
read_part_sector+0xd4/0x370 block/partitions/core.c:722
adfspart_check_ICS+0x93/0x940 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x723/0x1520 block/partitions/core.c:693
blkdev_get_whole+0x187/0x290 block/bdev.c:748
bdev_open+0x2c7/0xe40 block/bdev.c:957
blkdev_open+0x34e/0x4f0 block/fops.c:694
do_dentry_open+0x982/0x1530 fs/open.c:965
vfs_open+0x82/0x3f0 fs/open.c:1097
do_open fs/namei.c:3975 [inline]
path_openat+0x1de4/0x2cb0 fs/namei.c:4134
do_filp_open+0x20b/0x470 fs/namei.c:4161
do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #4 (set->srcu){.+.+}-{0:0}:
srcu_lock_sync include/linux/srcu.h:173 [inline]
__synchronize_srcu+0xa1/0x290 kernel/rcu/srcutree.c:1439
blk_mq_wait_quiesce_done block/blk-mq.c:283 [inline]
blk_mq_wait_quiesce_done block/blk-mq.c:280 [inline]
blk_mq_quiesce_queue block/blk-mq.c:303 [inline]
blk_mq_quiesce_queue+0x149/0x1b0 block/blk-mq.c:298
elevator_switch+0x17d/0x810 block/elevator.c:588
elevator_change+0x391/0x5d0 block/elevator.c:691
elevator_set_default+0x2e9/0x380 block/elevator.c:767
blk_register_queue+0x384/0x4e0 block/blk-sysfs.c:942
__add_disk+0x74a/0xf00 block/genhd.c:528
add_disk_fwnode+0x13f/0x5d0 block/genhd.c:597
add_disk include/linux/blkdev.h:775 [inline]
nbd_dev_add+0x783/0xbb0 drivers/block/nbd.c:1981
nbd_init+0x181/0x320 drivers/block/nbd.c:2688
do_one_initcall+0x120/0x6e0 init/main.c:1283
do_initcall_level init/main.c:1345 [inline]
do_initcalls init/main.c:1361 [inline]
do_basic_setup init/main.c:1380 [inline]
kernel_init_freeable+0x5c2/0x910 init/main.c:1593
kernel_init+0x1c/0x2b0 init/main.c:1483
ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #3 (&q->elevator_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:598 [inline]
__mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760
elevator_change+0x17d/0x5d0 block/elevator.c:689
elv_iosched_store+0x315/0x3c0 block/elevator.c:824
queue_attr_store+0x268/0x310 block/blk-sysfs.c:869
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142
kernfs_fop_write_iter+0x3af/0x570 fs/kernfs/file.c:352
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x7d3/0x11d0 fs/read_write.c:686
ksys_write+0x12a/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&q->q_usage_counter(io)#62){++++}-{0:0}:
blk_alloc_queue+0x619/0x760 block/blk-core.c:461
blk_mq_alloc_queue+0x172/0x280 block/blk-mq.c:4399
__blk_mq_alloc_disk+0x29/0x120 block/blk-mq.c:4446
nbd_dev_add+0x492/0xbb0 drivers/block/nbd.c:1951
nbd_init+0x181/0x320 drivers/block/nbd.c:2688
do_one_initcall+0x120/0x6e0 init/main.c:1283
do_initcall_level init/main.c:1345 [inline]
do_initcalls init/main.c:1361 [inline]
do_basic_setup init/main.c:1380 [inline]
kernel_init_freeable+0x5c2/0x910 init/main.c:1593
kernel_init+0x1c/0x2b0 init/main.c:1483
ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #1 (fs_reclaim){+.+.}-{0:0}:
__fs_reclaim_acquire mm/page_alloc.c:4269 [inline]
fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:4283
might_alloc include/linux/sched/mm.h:318 [inline]
prepare_alloc_pages+0x162/0x610 mm/page_alloc.c:4951
__alloc_frozen_pages_noprof+0x18b/0x2470 mm/page_alloc.c:5172
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2507
pagetable_alloc_noprof include/linux/mm.h:2975 [inline]
pmd_alloc_one_noprof include/asm-generic/pgalloc.h:142 [inline]
__pmd_alloc+0x3b/0x8b0 mm/memory.c:6573
pmd_alloc include/linux/mm.h:2932 [inline]
huge_pte_alloc+0x41d/0x5b0 mm/hugetlb.c:7682
hugetlb_fault+0x373/0x2f40 mm/hugetlb.c:6707
handle_mm_fault+0xbfa/0xd10 mm/memory.c:6485
do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]
strncpy_from_user+0x147/0x2e0 lib/strncpy_from_user.c:130
getname_flags.part.0+0x8f/0x550 fs/namei.c:157
getname_flags+0x93/0xf0 include/linux/audit.h:345
getname include/linux/fs.h:2921 [inline]
do_sys_openat2+0xb8/0x1d0 fs/open.c:1431
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&resv_map->rw_sema){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
down_read+0x9b/0x480 kernel/locking/rwsem.c:1537
hugetlb_vma_lock_read mm/hugetlb.c:305 [inline]
hugetlb_vma_lock_read+0xff/0x130 mm/hugetlb.c:296
hugetlb_fault+0x30a/0x2f40 mm/hugetlb.c:6706
handle_mm_fault+0xbfa/0xd10 mm/memory.c:6485
do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
rep_movs_alternative+0x30/0x90 arch/x86/lib/copy_user_64.S:53
copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
_inline_copy_from_user include/linux/uaccess.h:178 [inline]
_copy_from_user+0x98/0xd0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
user_termios_to_kernel_termios+0x21/0x30 drivers/tty/tty_ioctl.c:398
set_termios+0x233/0x880 drivers/tty/tty_ioctl.c:467
tty_mode_ioctl+0xbd8/0xd30 drivers/tty/tty_ioctl.c:826
n_tty_ioctl_helper+0x4b/0x2b0 drivers/tty/tty_ioctl.c:982
n_tty_ioctl+0x7f/0x370 drivers/tty/n_tty.c:2509
tty_ioctl+0x6fd/0x1680 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&resv_map->rw_sema --> sk_lock-AF_INET --> &hugetlb_fault_mutex_table[i]
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&hugetlb_fault_mutex_table[i]);
lock(sk_lock-AF_INET);
lock(&hugetlb_fault_mutex_table[i]);
rlock(&resv_map->rw_sema);
*** DEADLOCK ***
3 locks held by syz.0.3156/19232:
#0: ffff88806262b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffff88807daf01e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:387 [inline]
#1: ffff88807daf01e0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:368 [inline]
#1: ffff88807daf01e0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x35/0x6e0 mm/mmap_lock.c:428
#2: ffff888143ea6728 (&hugetlb_fault_mutex_table[i]){+.+.}-{4:4}, at: hugetlb_fault+0x302/0x2f40 mm/hugetlb.c:6699
stack backtrace:
CPU: 0 UID: 0 PID: 19232 Comm: syz.0.3156 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043
check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
down_read+0x9b/0x480 kernel/locking/rwsem.c:1537
hugetlb_vma_lock_read mm/hugetlb.c:305 [inline]
hugetlb_vma_lock_read+0xff/0x130 mm/hugetlb.c:296
hugetlb_fault+0x30a/0x2f40 mm/hugetlb.c:6706
handle_mm_fault+0xbfa/0xd10 mm/memory.c:6485
do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x30/0x90 arch/x86/lib/copy_user_64.S:60
Code: 83 f9 08 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 e9 cd 23 04 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <48> 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08
RSP: 0018:ffffc9000e307a08 EFLAGS: 00050206
RAX: 0000000000000001 RBX: 0000000000000038 RCX: 000000000000002c
RDX: fffff52001c60f63 RSI: 0000000000000038 RDI: ffffc9000e307af0
RBP: 000000000000002c R08: 0000000000000001 R09: fffff52001c60f63
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc9000e307af0 R14: ffffc9000e307af0 R15: dffffc0000000000
copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
_inline_copy_from_user include/linux/uaccess.h:178 [inline]
_copy_from_user+0x98/0xd0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
user_termios_to_kernel_termios+0x21/0x30 drivers/tty/tty_ioctl.c:398
set_termios+0x233/0x880 drivers/tty/tty_ioctl.c:467
tty_mode_ioctl+0xbd8/0xd30 drivers/tty/tty_ioctl.c:826
n_tty_ioctl_helper+0x4b/0x2b0 drivers/tty/tty_ioctl.c:982
n_tty_ioctl+0x7f/0x370 drivers/tty/n_tty.c:2509
tty_ioctl+0x6fd/0x1680 drivers/tty/tty_io.c:2801
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f733818eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7339054038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f73383e5fa0 RCX: 00007f733818eec9
RDX: 0000000000000038 RSI: 00000000402c542b RDI: 0000000000000003
RBP: 00007f7338211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f73383e6038 R14: 00007f73383e5fa0 R15: 00007fff2c7f4708
</TASK>
----------------
Code disassembly (best guess):
0: 83 f9 08 cmp $0x8,%ecx
3: 73 25 jae 0x2a
5: 85 c9 test %ecx,%ecx
7: 74 0f je 0x18
9: 8a 06 mov (%rsi),%al
b: 88 07 mov %al,(%rdi)
d: 48 ff c7 inc %rdi
10: 48 ff c6 inc %rsi
13: 48 ff c9 dec %rcx
16: 75 f1 jne 0x9
18: e9 cd 23 04 00 jmp 0x423ea
1d: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1)
24: 00 00 00 00
28: 66 90 xchg %ax,%ax
* 2a: 48 8b 06 mov (%rsi),%rax <-- trapping instruction
2d: 48 89 07 mov %rax,(%rdi)
30: 48 83 c6 08 add $0x8,%rsi
34: 48 83 c7 08 add $0x8,%rdi
38: 83 e9 08 sub $0x8,%ecx
3b: 74 db je 0x18
3d: 83 f9 08 cmp $0x8,%ecx
---
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