INFO: task syz.1.889:13920 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.889 state:D stack:25344 pid:13920 tgid:13919 ppid:5600 task_flags:0x400140 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x16d9/0x5700 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7376
schedule_timeout+0xc0/0x2c0 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2ca/0x5e0 kernel/sched/completion.c:153
kthread_flush_worker+0x138/0x1a0 kernel/kthread.c:1579
__alloc_workqueue+0x16f4/0x1fe0 kernel/workqueue.c:6011
alloc_workqueue_va kernel/workqueue.c:6033 [inline]
alloc_workqueue_noprof+0xe3/0x210 kernel/workqueue.c:6049
btrfs_init_workqueues+0x217/0x680 fs/btrfs/disk-io.c:1978
open_ctree+0x14d0/0x4190 fs/btrfs/disk-io.c:3540
btrfs_fill_super fs/btrfs/super.c:974 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1969 [inline]
btrfs_get_tree_subvol fs/btrfs/super.c:2112 [inline]
btrfs_get_tree+0x1084/0x1980 fs/btrfs/super.c:2146
vfs_get_tree+0x92/0x2a0 fs/super.c:1933
fc_mount fs/namespace.c:1198 [inline]
do_new_mount_fc fs/namespace.c:3772 [inline]
do_new_mount+0x319/0xdc0 fs/namespace.c:3848
do_mount fs/namespace.c:4181 [inline]
__do_sys_mount fs/namespace.c:4397 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4374
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f377869f3ca
RSP: 002b:00007f37768f5e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f37768f5ee0 RCX: 00007f377869f3ca
RDX: 0000200000005100 RSI: 0000200000000040 RDI: 00007f37768f5ea0
RBP: 0000200000005100 R08: 00007f37768f5ee0 R09: 0000000000800810
R10: 0000000000800810 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f37768f5ea0 R14: 000000000000510a R15: 0000200000000140
INFO: task syz.4.886:13926 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.886 state:D stack:25352 pid:13926 tgid:13923 ppid:5597 task_flags:0x400140 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x16d9/0x5700 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7376
schedule_timeout+0xc0/0x2c0 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2ca/0x5e0 kernel/sched/completion.c:153
kthread_flush_worker+0x138/0x1a0 kernel/kthread.c:1579
__alloc_workqueue+0x16f4/0x1fe0 kernel/workqueue.c:6011
alloc_workqueue_va kernel/workqueue.c:6033 [inline]
alloc_workqueue_noprof+0xe3/0x210 kernel/workqueue.c:6049
btrfs_init_workqueues+0x260/0x680 fs/btrfs/disk-io.c:1979
open_ctree+0x14d0/0x4190 fs/btrfs/disk-io.c:3540
btrfs_fill_super fs/btrfs/super.c:974 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1969 [inline]
btrfs_get_tree_subvol fs/btrfs/super.c:2112 [inline]
btrfs_get_tree+0x1084/0x1980 fs/btrfs/super.c:2146
vfs_get_tree+0x92/0x2a0 fs/super.c:1933
fc_mount fs/namespace.c:1198 [inline]
do_new_mount_fc fs/namespace.c:3772 [inline]
do_new_mount+0x319/0xdc0 fs/namespace.c:3848
do_mount fs/namespace.c:4181 [inline]
__do_sys_mount fs/namespace.c:4397 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4374
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f11346ff3ca
RSP: 002b:00007f1132955e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1132955ee0 RCX: 00007f11346ff3ca
RDX: 0000200000005100 RSI: 0000200000000040 RDI: 00007f1132955ea0
RBP: 0000200000005100 R08: 00007f1132955ee0 R09: 0000000000800810
R10: 0000000000800810 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f1132955ea0 R14: 000000000000510a R15: 0000200000000140
Showing all locks held in the system:
locks held by khungtaskd/39: 1, last CPU#1:
#0: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by kworker/u8:4/67: 2, last CPU#1:
#0: ffff88806810b938 ((wq_completion)btrfs-endio-meta#238){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff88806810b938 ((wq_completion)btrfs-endio-meta#238){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff88806810b938 ((wq_completion)btrfs-endio-meta#238){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#0: ffff88806810b938 ((wq_completion)btrfs-endio-meta#238){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#1: ffffc9000152fc40 ((work_completion)(&bbio->end_io_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc9000152fc40 ((work_completion)(&bbio->end_io_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc9000152fc40 ((work_completion)(&bbio->end_io_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#1: ffffc9000152fc40 ((work_completion)(&bbio->end_io_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
locks held by kworker/1:2/1237: 3, last CPU#1:
#0: ffff88813ff26538 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff88813ff26538 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff88813ff26538 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#0: ffff88813ff26538 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#1: ffffc90006357c40 ((work_completion)(&(&gc_work->dwork)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc90006357c40 ((work_completion)(&(&gc_work->dwork)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc90006357c40 ((work_completion)(&(&gc_work->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#1: ffffc90006357c40 ((work_completion)(&(&gc_work->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#2: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#2: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#2: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: gc_worker+0x274/0x18b0 net/netfilter/nf_conntrack_core.c:1532
locks held by kworker/u8:21/3371: 4, on CPU#0:
#0: ffff88801aeb0938 ((wq_completion)netns){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff88801aeb0938 ((wq_completion)netns){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff88801aeb0938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#0: ffff88801aeb0938 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#1: ffffc9000f46fc40 (net_cleanup_work){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc9000f46fc40 (net_cleanup_work){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc9000f46fc40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#1: ffffc9000f46fc40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#2: ffffffff8f5c7060 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810 net/core/net_namespace.c:677
#3: ffff888035bb1978 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_destruct+0x116/0x310 drivers/net/wireguard/device.c:249
locks held by getty/5346: 2, on CPU#1:
#0: ffff888032c2c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900044e32e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
locks held by syz.1.889/13920: 1, on CPU#1:
#0: ffff888034ea60e0 (&type->s_umount_key#57/1){+.+.}-{4:4}, at: alloc_super fs/super.c:351 [inline]
#0: ffff888034ea60e0 (&type->s_umount_key#57/1){+.+.}-{4:4}, at: sget_fc+0x97c/0x1a60 fs/super.c:875
locks held by syz.4.886/13926: 1, on CPU#1:
#0: ffff88803ac160e0 (&type->s_umount_key#57/1){+.+.}-{4:4}, at: alloc_super fs/super.c:351 [inline]
#0: ffff88803ac160e0 (&type->s_umount_key#57/1){+.+.}-{4:4}, at: sget_fc+0x97c/0x1a60 fs/super.c:875
locks held by syz-executor/14067: 4, last CPU#0:
#0: ffff888040a9c0e0 (&type->s_umount_key#33){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff888040a9c0e0 (&type->s_umount_key#33){++++}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
#0: ffff888040a9c0e0 (&type->s_umount_key#33){++++}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:617
#1: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: lruvec_stat_mod_folio+0x6e/0x3e0 mm/memcontrol.c:1028
#2: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: debug_object_activate+0xa8/0x3b0 lib/debugobjects.c:873
#3: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#3: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#3: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: get_non_dying_memcg_start mm/memcontrol.c:862 [inline]
#3: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: mod_memcg_lruvec_state+0xd5/0x270 mm/memcontrol.c:992
locks held by udevadm/15614: 2, last CPU#0:
#0: ffff88813ff77238 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_getlink fs/kernfs/symlink.c:120 [inline]
#0: ffff88813ff77238 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_iop_get_link+0xdf/0x6c0 fs/kernfs/symlink.c:140
#1: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
#1: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: kernfs_root+0x1c/0x230 fs/kernfs/kernfs-internal.h:76
locks held by sed/15622: 1, last CPU#0:
#0: ffff888035a8acb0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
#0: ffff888035a8acb0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1e0/0x4e0 mm/util.c:579
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 39 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x38b/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
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: 5596 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4921 [inline]
RIP: 0010:__lock_acquire+0x57b/0x2de0 kernel/locking/lockdep.c:5238
Code: 00 41 b4 03 41 83 be e0 0b 00 00 00 0f 84 e7 04 00 00 41 3b 9e 08 0c 00 00 0f 8d f3 00 00 00 4c 63 fb 4b 8d 04 bf 49 8d 1c c6 <48> 81 c3 38 0c 00 00 eb 1d 44 89 e0 49 ff c7 49 63 8e 08 0c 00 00
RSP: 0018:ffffc90004cff218 EFLAGS: 00000097
RAX: 0000000000000000 RBX: ffff888040de0000 RCX: 00000000ffffffff
RDX: 0000000000000003 RSI: 0000000000020000 RDI: b700000000000000
RBP: ffff888040de0c40 R08: ffffffff8177f1bf R09: 0000000000000000
R10: ffffc90004cff4f8 R11: ffffffff81b15fe0 R12: ffffffffffffff05
R13: 0000000000000000 R14: ffff888040de0000 R15: 0000000000000000
FS: 000055557d264500(0000) GS:ffff888125bc4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f48c0ba04e8 CR3: 0000000054074000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5414 [inline]
__kmalloc_noprof+0x41d/0x790 mm/slub.c:5439
_kmalloc_noprof include/linux/slab.h:995 [inline]
tomoyo_realpath_from_path+0xef/0x640 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x283/0x560 security/tomoyo/file.c:827
security_inode_getattr+0x12b/0x310 security/security.c:1895
vfs_getattr+0x23/0x70 fs/stat.c:259
vfs_statx_path+0x2b/0x230 fs/stat.c:299
vfs_statx+0x12e/0x200 fs/stat.c:356
vfs_fstatat+0x11b/0x170 fs/stat.c:373
__do_sys_newfstatat fs/stat.c:538 [inline]
__se_sys_newfstatat fs/stat.c:532 [inline]
__x64_sys_newfstatat+0x151/0x200 fs/stat.c:532
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd83049c79a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 c7 c2 e8 ff ff ff f7
RSP: 002b:00007ffe3c1e4f08 EFLAGS: 00000286 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007fd8305344bb RCX: 00007fd83049c79a
RDX: 00007ffe3c1e4f30 RSI: 00007ffe3c1e4fc0 RDI: 00000000ffffff9c
RBP: 00007ffe3c1e4fc0 R08: 00007ffe3c1e5fc0 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000286 R12: 00007ffe3c1e6050
R13: 00007fd8305344bb R14: 00000000000d88dd R15: 00007ffe3c1e6090