[syzbot] [ntfs3?] INFO: task hung in ni_readpage_cmpr (3)
1 view
Skip to first unread message
syzbot
Dec 16, 2025, 7:46:28 PM (14 hours ago) Dec 16
to almaz.ale...@paragon-software.com, linux-...@vger.kernel.org, nt...@lists.linux.dev, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 4a5663c04bb6 Add linux-next specific files for 20251215
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1424ad92580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a94030c847137a18
dashboard link: https://syzkaller.appspot.com/bug?extid=5af33dd272b913b65880
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1558b9c2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14895b14580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/893a2318f286/disk-4a5663c0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/463a87b4b88f/vmlinux-4a5663c0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f56cdb6e8801/bzImage-4a5663c0.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/e8c6f647a59e/mount_0.gz
The issue was bisected to:
commit f35590ee26f5722bfe12cdff14396c4c057a8f74
Author: Konstantin Komarov <almaz.ale...@paragon-software.com>
Date: Tue Oct 14 17:36:17 2025 +0000
fs/ntfs3: remove ntfs_bio_pages and use page cache for compressed I/O
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1048ab0a580000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1248ab0a580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1448ab0a580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5af33d...@syzkaller.appspotmail.com
Fixes: f35590ee26f5 ("fs/ntfs3: remove ntfs_bio_pages and use page cache for compressed I/O")
INFO: task syz.0.17:6022 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17 state:D stack:23456 pid:6022 tgid:6022 ppid:5940 task_flags:0x440140 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
__schedule_loop kernel/sched/core.c:6948 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6963
io_schedule+0x80/0xd0 kernel/sched/core.c:7792
folio_wait_bit_common+0x6b0/0xb80 mm/filemap.c:1323
__folio_lock mm/filemap.c:1699 [inline]
folio_lock include/linux/pagemap.h:1159 [inline]
__filemap_get_folio_mpol+0x13e/0xb00 mm/filemap.c:1954
__filemap_get_folio include/linux/pagemap.h:763 [inline]
ntfs_lock_new_page+0x30/0x7c0 fs/ntfs3/frecord.c:2028
ni_readpage_cmpr+0x685/0x940 fs/ntfs3/frecord.c:2102
ntfs_read_folio+0x18d/0x200 fs/ntfs3/inode.c:739
read_pages+0x35d/0x580 mm/readahead.c:173
page_cache_ra_unbounded+0x750/0x990 mm/readahead.c:302
do_sync_mmap_readahead+0x394/0x870 mm/filemap.c:3360
filemap_fault+0x6ac/0x1290 mm/filemap.c:3549
__do_fault+0x138/0x390 mm/memory.c:5320
do_read_fault mm/memory.c:5755 [inline]
do_fault mm/memory.c:5889 [inline]
do_pte_missing+0x2206/0x3330 mm/memory.c:4401
handle_pte_fault mm/memory.c:6273 [inline]
__handle_mm_fault mm/memory.c:6411 [inline]
handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6580
do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74
Code: 48 04 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 <f3> a4 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48
RSP: 0018:ffffc900038a7cf8 EFLAGS: 00050202
RAX: 00007ffffffff001 RBX: 0000000000000094 RCX: 0000000000000094
RDX: 0000000000000001 RSI: 00002000000036c0 RDI: ffffc900038a7d60
RBP: ffffc900038a7ea8 R08: ffffc900038a7df3 R09: 1ffff92000714fbe
R10: dffffc0000000000 R11: fffff52000714fbf R12: 1ffff92000714fa8
R13: 0000000000000094 R14: ffffc900038a7d60 R15: 00002000000036c0
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:185 [inline]
_copy_from_user+0x7a/0xb0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:223 [inline]
copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline]
copy_from_bpfptr include/linux/bpfptr.h:59 [inline]
__sys_bpf+0x1e3/0x860 kernel/bpf/syscall.c:6137
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6272
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7d2f18f749
RSP: 002b:00007ffc38e4b368 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f7d2f3e5fa0 RCX: 00007f7d2f18f749
RDX: 0000000000000094 RSI: 00002000000036c0 RDI: 0000000000000005
RBP: 00007f7d2f213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7d2f3e5fa0 R14: 00007f7d2f3e5fa0 R15: 0000000000000003
</TASK>
Showing all locks held in the system:
1 lock held by rcu_exp_gp_kthr/18:
#0: ffff8880b863a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:639
1 lock held by khungtaskd/31:
#0: ffffffff8df41b20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df41b20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8df41b20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/0:2/106:
#0: ffff88813fe55948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x841/0x15a0 kernel/workqueue.c:3254
#1: ffffc90002707b80 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15a0 kernel/workqueue.c:3255
#2: ffff88807d5b0240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1f7/0x3b0 drivers/net/netdevsim/fib.c:1490
2 locks held by kworker/u8:5/151:
#0: ffff8880b863a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:639
#1: ffff8880b8624588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933
2 locks held by getty/5585:
#0: ffff88803466b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460 drivers/tty/n_tty.c:2211
2 locks held by syz.0.17/6022:
#0: ffff88805a50f270 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a50f270 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a50ee38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a50ee38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.1.18/6051:
#0: ffff88805a607270 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a607270 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a606e38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a606e38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.2.19/6083:
#0: ffff8880716da9a0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff8880716da9a0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff8880716da568 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff8880716da568 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.3.20/6104:
#0: ffff8880717993c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff8880717993c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff888071798f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff888071798f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.4.21/6132:
#0: ffff88805a5093c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a5093c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a508f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a508f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.5.22/6163:
#0: ffff8880716dc6c0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff8880716dc6c0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff8880716dc288 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff8880716dc288 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.6.23/6195:
#0: ffff88805a7b13c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a7b13c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a7b0f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a7b0f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
4 locks held by kworker/u8:15/6196:
2 locks held by syz.7.24/6225:
#0: ffff88805a7b63e0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a7b63e0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a7b5fa8 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a7b5fa8 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.8.25/6254:
#0: ffff88805a608c80 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a608c80 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a608848 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a608848 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.9.26/6289:
#0: ffff88805a60dc98 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a60dc98 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a60d860 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a60d860 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by dhcpcd/6290:
#0: ffff88805b61c260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1700 [inline]
#0: ffff88805b61c260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xd30 net/packet/af_packet.c:3197
#1: ffffffff8df47678 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#1: ffffffff8df47678 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:956
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xf95/0xfe0 kernel/hung_task.c:515
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d b3 70 0c 00 f3 0f 1e fa fb f4 <e9> 48 ee 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6
RAX: db7ff23837f9f800 RBX: ffffffff8197928a RCX: db7ff23837f9f800
RDX: 0000000000000001 RSI: ffffffff8d793d57 RDI: ffffffff8bc08460
RBP: ffffc90000197f10 R08: ffff8880b87336db R09: 1ffff110170e66db
R10: dffffc0000000000 R11: ffffed10170e66dc R12: ffffffff8f822c70
R13: 1ffff110039dcb70 R14: 0000000000000001 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125f32000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056496680a168 CR3: 0000000028dbe000 CR4: 00000000003526f0
Call Trace:
<TASK>
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x1ea/0x520 kernel/sched/idle.c:332
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x147
</TASK>
---
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.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 4a5663c04bb6 Add linux-next specific files for 20251215
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1424ad92580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a94030c847137a18
dashboard link: https://syzkaller.appspot.com/bug?extid=5af33dd272b913b65880
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1558b9c2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14895b14580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/893a2318f286/disk-4a5663c0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/463a87b4b88f/vmlinux-4a5663c0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f56cdb6e8801/bzImage-4a5663c0.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/e8c6f647a59e/mount_0.gz
The issue was bisected to:
commit f35590ee26f5722bfe12cdff14396c4c057a8f74
Author: Konstantin Komarov <almaz.ale...@paragon-software.com>
Date: Tue Oct 14 17:36:17 2025 +0000
fs/ntfs3: remove ntfs_bio_pages and use page cache for compressed I/O
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1048ab0a580000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1248ab0a580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1448ab0a580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5af33d...@syzkaller.appspotmail.com
Fixes: f35590ee26f5 ("fs/ntfs3: remove ntfs_bio_pages and use page cache for compressed I/O")
INFO: task syz.0.17:6022 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17 state:D stack:23456 pid:6022 tgid:6022 ppid:5940 task_flags:0x440140 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
__schedule_loop kernel/sched/core.c:6948 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6963
io_schedule+0x80/0xd0 kernel/sched/core.c:7792
folio_wait_bit_common+0x6b0/0xb80 mm/filemap.c:1323
__folio_lock mm/filemap.c:1699 [inline]
folio_lock include/linux/pagemap.h:1159 [inline]
__filemap_get_folio_mpol+0x13e/0xb00 mm/filemap.c:1954
__filemap_get_folio include/linux/pagemap.h:763 [inline]
ntfs_lock_new_page+0x30/0x7c0 fs/ntfs3/frecord.c:2028
ni_readpage_cmpr+0x685/0x940 fs/ntfs3/frecord.c:2102
ntfs_read_folio+0x18d/0x200 fs/ntfs3/inode.c:739
read_pages+0x35d/0x580 mm/readahead.c:173
page_cache_ra_unbounded+0x750/0x990 mm/readahead.c:302
do_sync_mmap_readahead+0x394/0x870 mm/filemap.c:3360
filemap_fault+0x6ac/0x1290 mm/filemap.c:3549
__do_fault+0x138/0x390 mm/memory.c:5320
do_read_fault mm/memory.c:5755 [inline]
do_fault mm/memory.c:5889 [inline]
do_pte_missing+0x2206/0x3330 mm/memory.c:4401
handle_pte_fault mm/memory.c:6273 [inline]
__handle_mm_fault mm/memory.c:6411 [inline]
handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6580
do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74
Code: 48 04 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 <f3> a4 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48
RSP: 0018:ffffc900038a7cf8 EFLAGS: 00050202
RAX: 00007ffffffff001 RBX: 0000000000000094 RCX: 0000000000000094
RDX: 0000000000000001 RSI: 00002000000036c0 RDI: ffffc900038a7d60
RBP: ffffc900038a7ea8 R08: ffffc900038a7df3 R09: 1ffff92000714fbe
R10: dffffc0000000000 R11: fffff52000714fbf R12: 1ffff92000714fa8
R13: 0000000000000094 R14: ffffc900038a7d60 R15: 00002000000036c0
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:185 [inline]
_copy_from_user+0x7a/0xb0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:223 [inline]
copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline]
copy_from_bpfptr include/linux/bpfptr.h:59 [inline]
__sys_bpf+0x1e3/0x860 kernel/bpf/syscall.c:6137
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6272
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7d2f18f749
RSP: 002b:00007ffc38e4b368 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f7d2f3e5fa0 RCX: 00007f7d2f18f749
RDX: 0000000000000094 RSI: 00002000000036c0 RDI: 0000000000000005
RBP: 00007f7d2f213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7d2f3e5fa0 R14: 00007f7d2f3e5fa0 R15: 0000000000000003
</TASK>
Showing all locks held in the system:
1 lock held by rcu_exp_gp_kthr/18:
#0: ffff8880b863a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:639
1 lock held by khungtaskd/31:
#0: ffffffff8df41b20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df41b20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8df41b20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/0:2/106:
#0: ffff88813fe55948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x841/0x15a0 kernel/workqueue.c:3254
#1: ffffc90002707b80 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15a0 kernel/workqueue.c:3255
#2: ffff88807d5b0240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1f7/0x3b0 drivers/net/netdevsim/fib.c:1490
2 locks held by kworker/u8:5/151:
#0: ffff8880b863a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:639
#1: ffff8880b8624588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933
2 locks held by getty/5585:
#0: ffff88803466b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460 drivers/tty/n_tty.c:2211
2 locks held by syz.0.17/6022:
#0: ffff88805a50f270 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a50f270 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a50ee38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a50ee38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.1.18/6051:
#0: ffff88805a607270 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a607270 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a606e38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a606e38 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.2.19/6083:
#0: ffff8880716da9a0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff8880716da9a0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff8880716da568 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff8880716da568 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.3.20/6104:
#0: ffff8880717993c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff8880717993c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff888071798f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff888071798f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.4.21/6132:
#0: ffff88805a5093c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a5093c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a508f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a508f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.5.22/6163:
#0: ffff8880716dc6c0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff8880716dc6c0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff8880716dc288 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff8880716dc288 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.6.23/6195:
#0: ffff88805a7b13c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a7b13c8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a7b0f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a7b0f90 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
4 locks held by kworker/u8:15/6196:
2 locks held by syz.7.24/6225:
#0: ffff88805a7b63e0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a7b63e0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a7b5fa8 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a7b5fa8 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.8.25/6254:
#0: ffff88805a608c80 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a608c80 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a608848 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a608848 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by syz.9.26/6289:
#0: ffff88805a60dc98 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88805a60dc98 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x1cf/0x990 mm/readahead.c:233
#1: ffff88805a60d860 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline]
#1: ffff88805a60d860 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_read_folio+0x180/0x200 fs/ntfs3/inode.c:738
2 locks held by dhcpcd/6290:
#0: ffff88805b61c260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1700 [inline]
#0: ffff88805b61c260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xd30 net/packet/af_packet.c:3197
#1: ffffffff8df47678 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#1: ffffffff8df47678 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:956
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xf95/0xfe0 kernel/hung_task.c:515
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d b3 70 0c 00 f3 0f 1e fa fb f4 <e9> 48 ee 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6
RAX: db7ff23837f9f800 RBX: ffffffff8197928a RCX: db7ff23837f9f800
RDX: 0000000000000001 RSI: ffffffff8d793d57 RDI: ffffffff8bc08460
RBP: ffffc90000197f10 R08: ffff8880b87336db R09: 1ffff110170e66db
R10: dffffc0000000000 R11: ffffed10170e66dc R12: ffffffff8f822c70
R13: 1ffff110039dcb70 R14: 0000000000000001 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125f32000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056496680a168 CR3: 0000000028dbe000 CR4: 00000000003526f0
Call Trace:
<TASK>
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x1ea/0x520 kernel/sched/idle.c:332
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x147
</TASK>
---
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.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
Reply all
Reply to author
Forward
0 new messages