INFO: task syz.7.268:8643 blocked for more than 143 seconds.
Not tainted 6.15.0-rc5-syzkaller-00300-g3ce9925823c7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.268 state:D
stack:19816 pid:8643 tgid:8641 ppid:7580 task_flags:0x400140 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x168f/0x4c70 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6860
__closure_sync+0x163/0x220 lib/closure.c:146
closure_sync include/linux/closure.h:195 [inline]
bch2_direct_IO_read fs/bcachefs/fs-io-direct.c:179 [inline]
bch2_read_iter+0x1035/0x1440 fs/bcachefs/fs-io-direct.c:214
new_sync_read fs/read_write.c:489 [inline]
vfs_read+0x4cd/0x980 fs/read_write.c:570
ksys_read+0x145/0x250 fs/read_write.c:713
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe8c158e969
RSP: 002b:00007fe8c24c1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fe8c17b5fa0 RCX: 00007fe8c158e969
RDX: 0000000000001000 RSI: 0000200000000400 RDI: 0000000000000005
RBP: 00007fe8c1610ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe8c17b5fa0 R15: 00007fffada5cfc8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
2 locks held by udevd/5192:
2 locks held by getty/5582:
#0: ffff888033e0a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036c32f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by udevd/5823:
1 lock held by syz.7.268/8643:
#0: ffff88803227e7f8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1213
2 locks held by syz-executor/9425:
2 locks held by syz.0.526/11180:
1 lock held by syz.8.523/11184:
3 locks held by dhcpcd-run-hook/11206:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc5-syzkaller-00300-g3ce9925823c7 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
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:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:437
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5823 Comm: udevd Not tainted 6.15.0-rc5-syzkaller-00300-g3ce9925823c7 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:resched_offsets_ok kernel/sched/core.c:8767 [inline]
RIP: 0010:__might_resched+0x155/0x610 kernel/sched/core.c:8782
Code: 44 8b 3d 7e 8b df 10 41 81 e7 ff ff ff 7f 65 48 8b 14 25 08 00 72 92 4c 8d b2 44 04 00 00 4d 89 f4 49 c1 ec 03 43 0f b6 04 2c <84> c0 0f 85 49 03 00 00 41 8b 06 c1 e0 08 44 01 f8 3b 44 24 2c 75
RSP: 0018:ffffc90004317580 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: 1ffff92000862eb8 RCX: 7075b522161d7600
RDX: ffff88805acc0000 RSI: ffffffff8d921532 RDI: ffffffff8bc0ffa0
RBP: ffffc90004317698 R08: ffff88805acc0000 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: 1ffff1100b598088
R13: dffffc0000000000 R14: ffff88805acc0444 R15: 0000000000000000
FS: 00007fce7f619880(0000) GS:ffff888126200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fce7f615000 CR3: 0000000076d9e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
down_read+0x22/0x2e0 kernel/locking/rwsem.c:1523
anon_vma_lock_read include/linux/rmap.h:137 [inline]
validate_mm+0x1d4/0x4b0 mm/vma.c:623
__split_vma+0x867/0x9b0 mm/vma.c:524
vms_gather_munmap_vmas+0x2de/0x12b0 mm/vma.c:1315
do_vmi_align_munmap+0x25d/0x420 mm/vma.c:1483
do_vmi_munmap+0x253/0x2e0 mm/vma.c:1540
__vm_munmap+0x23b/0x3d0 mm/vma.c:3013
__do_sys_munmap mm/mmap.c:1084 [inline]
__se_sys_munmap mm/mmap.c:1081 [inline]
__x64_sys_munmap+0x60/0x70 mm/mmap.c:1081
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fce7ef1e097
Code: 73 01 c3 48 8b 0d 61 2d 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 31 2d 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007fffb3209788 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000555e8075e350 RCX: 00007fce7ef1e097
RDX: 0000555e8075e398 RSI: 0000000000000200 RDI: 00007fce7f60b000
RBP: 000000000000000c R08: 0000555e80769480 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000246 R12: 0000555e8076dc80
R13: 00007fce7f74039c R14: 0000000000001800 R15: 0000000000000009