syzbot has found a reproducer for the following issue on:
HEAD commit: 1cc3fcf63192 Linux 6.1.18
git tree: linux-6.1.y
console output:
https://syzkaller.appspot.com/x/log.txt?x=10db9724c80000
kernel config:
https://syzkaller.appspot.com/x/.config?x=157296d36f92ea19
syz repro:
https://syzkaller.appspot.com/x/repro.syz?x=16607072c80000
C reproducer:
https://syzkaller.appspot.com/x/repro.c?x=17584f66c80000
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/0e4c0d43698b/disk-1cc3fcf6.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/a4de39d735de/vmlinux-1cc3fcf6.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/82bab928f6e3/Image-1cc3fcf6.gz.xz
INFO: task syz-executor747:4350 blocked for more than 143 seconds.
Not tainted 6.1.18-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor747 state:D stack:0 pid:4350 ppid:4348 flags:0x00000001
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:553
context_switch kernel/sched/core.c:5238 [inline]
__schedule+0xf9c/0x1d84 kernel/sched/core.c:6551
schedule+0xc4/0x170 kernel/sched/core.c:6627
rwsem_down_write_slowpath+0xc80/0x156c kernel/locking/rwsem.c:1189
__down_write_common kernel/locking/rwsem.c:1314 [inline]
__down_write kernel/locking/rwsem.c:1323 [inline]
down_write+0x84/0x88 kernel/locking/rwsem.c:1574
filemap_invalidate_lock include/linux/fs.h:801 [inline]
blkdev_fallocate+0x1d4/0x340 block/fops.c:656
vfs_fallocate+0x478/0x5b4 fs/open.c:323
ksys_fallocate fs/open.c:346 [inline]
__do_sys_fallocate fs/open.c:354 [inline]
__se_sys_fallocate fs/open.c:352 [inline]
__arm64_sys_fallocate+0xc0/0x110 fs/open.c:352
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
INFO: task syz-executor747:4353 blocked for more than 143 seconds.
Not tainted 6.1.18-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor747 state:D stack:0 pid:4353 ppid:4347 flags:0x00000001
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:553
context_switch kernel/sched/core.c:5238 [inline]
__schedule+0xf9c/0x1d84 kernel/sched/core.c:6551
schedule+0xc4/0x170 kernel/sched/core.c:6627
rwsem_down_write_slowpath+0xc80/0x156c kernel/locking/rwsem.c:1189
__down_write_common kernel/locking/rwsem.c:1314 [inline]
__down_write kernel/locking/rwsem.c:1323 [inline]
down_write+0x84/0x88 kernel/locking/rwsem.c:1574
filemap_invalidate_lock include/linux/fs.h:801 [inline]
blkdev_fallocate+0x1d4/0x340 block/fops.c:656
vfs_fallocate+0x478/0x5b4 fs/open.c:323
ksys_fallocate fs/open.c:346 [inline]
__do_sys_fallocate fs/open.c:354 [inline]
__se_sys_fallocate fs/open.c:352 [inline]
__arm64_sys_fallocate+0xc0/0x110 fs/open.c:352
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
INFO: task syz-executor747:4354 blocked for more than 143 seconds.
Not tainted 6.1.18-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor747 state:D stack:0 pid:4354 ppid:4344 flags:0x00000001
Call trace:
__switch_to+0x320/0x754 arch/arm64/kernel/process.c:553
context_switch kernel/sched/core.c:5238 [inline]
__schedule+0xf9c/0x1d84 kernel/sched/core.c:6551
schedule+0xc4/0x170 kernel/sched/core.c:6627
rwsem_down_write_slowpath+0xc80/0x156c kernel/locking/rwsem.c:1189
__down_write_common kernel/locking/rwsem.c:1314 [inline]
__down_write kernel/locking/rwsem.c:1323 [inline]
down_write+0x84/0x88 kernel/locking/rwsem.c:1574
filemap_invalidate_lock include/linux/fs.h:801 [inline]
blkdev_fallocate+0x1d4/0x340 block/fops.c:656
vfs_fallocate+0x478/0x5b4 fs/open.c:323
ksys_fallocate fs/open.c:346 [inline]
__do_sys_fallocate fs/open.c:354 [inline]
__se_sys_fallocate fs/open.c:352 [inline]
__arm64_sys_fallocate+0xc0/0x110 fs/open.c:352
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffff800015905db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:510
1 lock held by rcu_tasks_trace/13:
#0: ffff8000159065b0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:510
1 lock held by khungtaskd/28:
#0: ffff800015905be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:305
1 lock held by klogd/3828:
2 locks held by getty/3994:
#0: ffff0000d3f2a098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
#1: ffff80001bbc02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1210 drivers/tty/n_tty.c:2177
1 lock held by syz-executor747/4350:
#0: ffff0000c05493d8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:801 [inline]
#0: ffff0000c05493d8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_fallocate+0x1d4/0x340 block/fops.c:656
1 lock held by syz-executor747/4352:
1 lock held by syz-executor747/4353:
#0: ffff0000c05493d8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:801 [inline]
#0: ffff0000c05493d8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_fallocate+0x1d4/0x340 block/fops.c:656
1 lock held by syz-executor747/4354:
#0: ffff0000c05493d8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:801 [inline]
#0: ffff0000c05493d8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_fallocate+0x1d4/0x340 block/fops.c:656
1 lock held by syz-executor747/4356:
#0: ffff0000c05493d8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:801 [inline]
#0: ffff0000c05493d8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_fallocate+0x1d4/0x340 block/fops.c:656
1 lock held by syz-executor747/4363:
#0: ffff0000c05493d8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:801 [inline]
#0: ffff0000c05493d8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_fallocate+0x1d4/0x340 block/fops.c:656
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