INFO: task syz-executor:6189 blocked for more than 143 seconds.
Not tainted 6.16.0-rc2-next-20250617-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21960 pid:6189 tgid:6189 ppid:1 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5313 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6696
__schedule_loop kernel/sched/core.c:6774 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6789
__bch2_fs_stop+0x704/0x900 fs/bcachefs/super.c:696
generic_shutdown_super+0x132/0x2c0 fs/super.c:643
bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2618
deactivate_locked_super+0xbc/0x130 fs/super.c:474
cleanup_mnt+0x425/0x4c0 fs/namespace.c:1417
task_work_run+0x1d4/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f302d98fc57
RSP: 002b:00007ffdc2e62438 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f302d98fc57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdc2e624f0
RBP: 00007ffdc2e624f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdc2e63580
R13: 00007f302da10925 R14: 0000000000024a38 R15: 00007ffdc2e635c0
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13ede0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13ede0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13ede0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
1 lock held by udevd/5204:
2 locks held by getty/5596:
#0: ffff88814c3250a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fee2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by udevd/5894:
#0: ffff888022d0faa0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:884 [inline]
#0: ffff888022d0faa0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: blkdev_read_iter+0x2f8/0x440 block/fops.c:832
1 lock held by syz-executor/6189:
#0: ffff8880290f00e0 (&type->s_umount_key#91){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff8880290f00e0 (&type->s_umount_key#91){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff8880290f00e0 (&type->s_umount_key#91){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:506
2 locks held by syz-executor/9922:
1 lock held by syz.9.1030/10131:
#0: ffff8880290f00e0 (&type->s_umount_key#91){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff8880290f00e0 (&type->s_umount_key#91){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
3 locks held by dhcpcd-run-hook/10391:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc2-next-20250617-syzkaller #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+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/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: 10391 Comm: dhcpcd-run-hook Not tainted 6.16.0-rc2-next-20250617-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x90 kernel/kcov.c:314
Code: 48 89 44 11 20 e9 08 09 ac 09 cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 14 25 08 00 9e 92 65 8b 0d 68 90 dd 10 81 e1 00 01 ff 00
RSP: 0018:ffffc90005857388 EFLAGS: 00000246
RAX: ffffffff820d5fac RBX: ffff88807a3ba040 RCX: ffff88807c590000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90005857630 R08: ffffffff8fa147f7 R09: 1ffffffff1f428fe
R10: dffffc0000000000 R11: fffffbfff1f428ff R12: dffffc0000000000
R13: ffff88805350b520 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f7e851f0c80(0000) GS:ffff888125c40000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f54f435c10 CR3: 00000000536c0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
add_mm_rss_vec+0x18c/0x320 mm/memory.c:497
copy_pte_range mm/memory.c:1223 [inline]
copy_pmd_range+0x671a/0x7000 mm/memory.c:1285
copy_pud_range mm/memory.c:1322 [inline]
copy_p4d_range mm/memory.c:1346 [inline]
copy_page_range+0xc46/0x1270 mm/memory.c:1434
dup_mmap+0xf57/0x1ac0 mm/mmap.c:1838
dup_mm kernel/fork.c:1476 [inline]
copy_mm+0x13c/0x4b0 kernel/fork.c:1528
copy_process+0x1706/0x3c00 kernel/fork.c:2168
kernel_clone+0x21e/0x870 kernel/fork.c:2598
__do_sys_clone kernel/fork.c:2741 [inline]
__se_sys_clone kernel/fork.c:2725 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2725
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: 0033:0x7f7e8538a636
Code: 89 df e8 6d e8 f6 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00
RSP: 002b:00007fff86c47d80 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff86c47d88 RCX: 00007f7e8538a636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 000055f54f430e60 R08: 0000000000000000 R09: 0000000000000030
R10: 00007f7e851f0f50 R11: 0000000000000246 R12: 000055f54f43d7c8
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000