INFO: task syz.1.81:6507 blocked for more than 143 seconds.
Not tainted 6.14.0-rc6-syzkaller-00022-gb7f94fcf5546 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.81 state:D stack:19984 pid:6507 tgid:6504 ppid:5821 task_flags:0x400140 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578
do_remount fs/namespace.c:3097 [inline]
path_mount+0xbdb/0xfa0 fs/namespace.c:3879
do_mount fs/namespace.c:3900 [inline]
__do_sys_mount fs/namespace.c:4111 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f92ec78e90a
RSP: 002b:00007f92ed546e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f92ed546ef0 RCX: 00007f92ec78e90a
RDX: 00004000000003c0 RSI: 0000400000000340 RDI: 0000000000000000
RBP: 00004000000003c0 R08: 00007f92ed546ef0 R09: 000000000126a4b5
R10: 000000000126a4b5 R11: 0000000000000246 R12: 0000400000000340
R13: 00007f92ed546eb0 R14: 0000000000000000 R15: 0000400000001a80
INFO: task syz.1.81:6508 blocked for more than 143 seconds.
Not tainted 6.14.0-rc6-syzkaller-00022-gb7f94fcf5546 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.81 state:D stack:26584 pid:6508 tgid:6504 ppid:5821 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
kthread_stop+0x1a1/0x640 kernel/kthread.c:791
bch2_copygc_stop+0x4f/0x150 fs/bcachefs/movinggc.c:413
__bch2_fs_read_only+0x47/0x450 fs/bcachefs/super.c:265
bch2_fs_read_only+0xbff/0x12a0 fs/bcachefs/super.c:356
bch2_remount fs/bcachefs/fs.c:2023 [inline]
bch2_fs_reconfigure+0x1fa/0x390 fs/bcachefs/fs.c:2355
reconfigure_super+0x43a/0x870 fs/super.c:1083
do_remount fs/namespace.c:3100 [inline]
path_mount+0xc22/0xfa0 fs/namespace.c:3879
do_mount fs/namespace.c:3900 [inline]
__do_sys_mount fs/namespace.c:4111 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f92ec78e90a
RSP: 002b:00007f92ed525e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f92ed525ef0 RCX: 00007f92ec78e90a
RDX: 00004000000003c0 RSI: 0000400000000340 RDI: 0000000000000000
RBP: 00004000000003c0 R08: 00007f92ed525ef0 R09: 000000000126a4b5
R10: 000000000126a4b5 R11: 0000000000000246 R12: 0000400000000340
R13: 00007f92ed525eb0 R14: 0000000000000000 R15: 0000400000001a80
INFO: task syz.5.91:6628 blocked for more than 144 seconds.
Not tainted 6.14.0-rc6-syzkaller-00022-gb7f94fcf5546 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.91 state:D stack:20336 pid:6628 tgid:6627 ppid:6257 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline]
__down_read_common kernel/locking/rwsem.c:1248 [inline]
__down_read kernel/locking/rwsem.c:1261 [inline]
down_read+0x705/0xa40 kernel/locking/rwsem.c:1526
__super_lock fs/super.c:58 [inline]
super_lock+0x27c/0x400 fs/super.c:120
super_lock_shared fs/super.c:139 [inline]
iterate_supers+0x8c/0x190 fs/super.c:931
quota_sync_all fs/quota/quota.c:69 [inline]
__do_sys_quotactl fs/quota/quota.c:938 [inline]
__se_sys_quotactl+0x38e/0xa30 fs/quota/quota.c:917
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f04eed8d169
RSP: 002b:00007f04efc93038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f04eefa5fa0 RCX: 00007f04eed8d169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f04eee0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f04eefa5fa0 R15: 00007ffca6bd7b88
Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
#0: ffffffff8eb3e8b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:302 [inline]
#0: ffffffff8eb3e8b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x381/0x820 kernel/rcu/tree_exp.h:996
3 locks held by kworker/u8:1/13:
1 lock held by khungtaskd/31:
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
5 locks held by kworker/u8:3/53:
3 locks held by kworker/u8:4/63:
3 locks held by kworker/u8:7/4370:
#0: ffff88801b089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801b089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3319
#1: ffffc9000e6cfc60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc9000e6cfc60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3319
#2: ffffffff8fec4508 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:285
2 locks held by getty/5586:
#0: ffff8880316140a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002ff62f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
3 locks held by kworker/0:5/5879:
#0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3319
#1: ffffc900042f7c60 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900042f7c60 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3319
#2: ffffffff8fec4508 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104
1 lock held by syz.1.81/6507:
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: do_remount fs/namespace.c:3097 [inline]
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: path_mount+0xbdb/0xfa0 fs/namespace.c:3879
2 locks held by syz.1.81/6508:
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: do_remount fs/namespace.c:3097 [inline]
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: path_mount+0xbdb/0xfa0 fs/namespace.c:3879
#1: ffff88805a080278 (&c->state_lock){+.+.}-{4:4}, at: bch2_remount fs/bcachefs/fs.c:2020 [inline]
#1: ffff88805a080278 (&c->state_lock){+.+.}-{4:4}, at: bch2_fs_reconfigure+0x18b/0x390 fs/bcachefs/fs.c:2355
1 lock held by syz.5.91/6628:
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.8.181/7720:
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.8.181/7730:
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.9.225/8179:
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.1.282/8851:
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88803453e0e0 (&type->s_umount_key#82){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz-executor/9613:
#0: ffffffff8fec4508 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline]
#0: ffffffff8fec4508 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x47e/0x1bc0 net/ipv4/devinet.c:987
2 locks held by syz.6.344/9651:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc6-syzkaller-00022-gb7f94fcf5546 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5811 Comm: syz-executor Not tainted 6.14.0-rc6-syzkaller-00022-gb7f94fcf5546 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__lock_acquire+0x475/0x2100 kernel/locking/lockdep.c:5176
Code: e5 15 09 d5 09 c5 09 cd 09 dd 48 8b 44 24 18 0f b6 04 30 84 c0 0f 85 c9 13 00 00 44 8b bc 24 e0 00 00 00 48 8b 44 24 10 89 28 <4a> 8d 5c ef 24 48 89 d8 48 c1 e8 03 0f b6 04 30 84 c0 0f 85 d3 13
RSP: 0018:ffffc90003eb7930 EFLAGS: 00000046
RAX: ffff888030ea0b38 RBX: 0000000000008001 RCX: 0000000000040000
RDX: 0000000000080000 RSI: dffffc0000000000 RDI: ffff888030ea0af0
RBP: 00000000000c8001 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff2077b0f R12: ffff888030ea0ad4
R13: 0000000000000005 R14: 0000000000000001 R15: 0000000000000000
FS: 00005555658b1500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f41fe5ff000 CR3: 000000003576a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__raw_spin_trylock include/linux/spinlock_api_smp.h:90 [inline]
_raw_spin_trylock+0x46/0x80 kernel/locking/spinlock.c:138
calc_usage lib/debugobjects.c:441 [inline]
alloc_object+0x5b/0x310 lib/debugobjects.c:455
lookup_object_or_alloc lib/debugobjects.c:685 [inline]
__debug_object_init+0x185/0x470 lib/debugobjects.c:743
debug_hrtimer_init_on_stack kernel/time/hrtimer.c:449 [inline]
debug_init_on_stack kernel/time/hrtimer.c:489 [inline]
hrtimer_setup_sleeper_on_stack kernel/time/hrtimer.c:2108 [inline]
hrtimer_nanosleep+0xb0/0x410 kernel/time/hrtimer.c:2186
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1402 [inline]
__se_sys_clock_nanosleep+0x32b/0x3c0 kernel/time/posix-timers.c:1379
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fceb4bbf9e3
Code: 1f 84 00 00 00 00 00 83 ff 03 74 7b 83 ff 02 b8 fa ff ff ff 49 89 ca 0f 44 f8 80 3d 5e db 1b 00 00 74 14 b8 e6 00 00 00 0f 05 d8 c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 28 48 89 54 24 10
RSP: 002b:00007ffca7171f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fceb4bbf9e3
RDX: 00007ffca7171fa0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000008e8b6da R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffca71723f0
R13: 0000000000000004 R14: 00007ffca7171fdc R15: 00007ffca7172070