INFO: task syz.1.9:6010 blocked for more than 143 seconds.
Not tainted 6.16.0-rc2-syzkaller-00162-g41687a5c6f8b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.9 state:D stack:23672 pid:6010 tgid:5979 ppid:5834 task_flags:0x400040 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
__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:180 [inline]
bch2_read_iter+0x1034/0x1440 fs/bcachefs/fs-io-direct.c:215
new_sync_read fs/read_write.c:491 [inline]
vfs_read+0x4cd/0x980 fs/read_write.c:572
ksys_read+0x145/0x250 fs/read_write.c:715
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f254e38e929
RSP: 002b:00007f254f1fd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f254e5b6080 RCX: 00007f254e38e929
RDX: 00000000fffffe32 RSI: 0000200000000000 RDI: 0000000000000008
RBP: 00007f254e410b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f254e5b6080 R15: 00007ffee719ccc8
Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
1 lock held by khungtaskd/31:
#0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by getty/5588:
#0: ffff88814c7170a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036bb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz.1.9/6010:
#0: ffff888030156d38 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1217
3 locks held by syz.2.310/8364:
3 locks held by syz.5.311/8377:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc2-syzkaller-00162-g41687a5c6f8b #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:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8377 Comm: syz.5.311 Not tainted 6.16.0-rc2-syzkaller-00162-g41687a5c6f8b #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4899 [inline]
RIP: 0010:__lock_acquire+0x581/0xd20 kernel/locking/lockdep.c:5190
Code: 90 31 c9 48 8b 3c 24 0f b6 81 c4 00 00 00 84 c0 0f 84 68 ff ff ff 41 0f b6 f4 0f b6 d0 40 38 c6 0f 42 d6 80 b9 c6 00 00 00 02 <0f> 84 51 ff ff ff 89 d0 e9 4a ff ff ff 48 c7 c7 b0 fe 00 8e 48 89
RSP: 0018:ffffc90003ecf300 EFLAGS: 00000093
RAX: 0000000000000003 RBX: 0000000000000002 RCX: ffffffff9342b080
RDX: 0000000000000003 RSI: 0000000000000003 RDI: ffff88807facbc00
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff822cc907
R10: dffffc0000000000 R11: ffffed100810100d R12: 0000000000000003
R13: 0000000000000001 R14: ffff88807facc768 R15: ffff88807facc760
FS: 00007fdd3c9776c0(0000) GS:ffff888125c83000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f81c4545000 CR3: 00000000336ac000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
page_table_check_clear+0x1a4/0x700 mm/page_table_check.c:77
ptep_get_and_clear_full arch/x86/include/asm/jump_label.h:-1 [inline]
zap_present_ptes mm/memory.c:1561 [inline]
do_zap_pte_range mm/memory.c:1691 [inline]
zap_pte_range mm/memory.c:1735 [inline]
zap_pmd_range mm/memory.c:1827 [inline]
zap_pud_range mm/memory.c:1856 [inline]
zap_p4d_range mm/memory.c:1877 [inline]
unmap_page_range+0x320e/0x41c0 mm/memory.c:1898
unmap_single_vma mm/memory.c:1941 [inline]
unmap_vmas+0x399/0x580 mm/memory.c:1985
vms_clear_ptes+0x35c/0x540 mm/vma.c:1223
vms_complete_munmap_vmas+0x206/0x8a0 mm/vma.c:1272
do_vmi_align_munmap+0x358/0x420 mm/vma.c:1531
do_vmi_munmap+0x253/0x2e0 mm/vma.c:1579
__vm_munmap+0x23b/0x3d0 mm/vma.c:3108
__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+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdd3bb8e9b7
Code: 00 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 0b 00 00 00 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:00007fdd3c976e18 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007fdd3bb8e9b7
RDX: 0000000000000000 RSI: 0000000008400000 RDI: 00007fdd31400000
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000050ed
R10: 000020000000a2c2 R11: 0000000000000246 R12: 0000000000000003
R13: 00007fdd3c976ef0 R14: 00007fdd3c976eb0 R15: 00007fdd31400000