INFO: task syz-executor:7004 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21416 pid:7004 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747
lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
jfs_umount+0x2ef/0x3c0 fs/jfs/jfs_umount.c:114
jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x134/0x2b0 fs/super.c:693
kill_block_super+0x44/0x90 fs/super.c:1660
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x43b/0x4d0 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7a1ab9e097
RSP: 002b:00007ffe88413248 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f7a1ac321ca RCX: 00007f7a1ab9e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe88413300
RBP: 00007ffe88413300 R08: 00007ffe88414300 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe88414390
R13: 00007f7a1ac321ca R14: 0000000000039249 R15: 00007ffe884143d0
INFO: task syz-executor:7015 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20968 pid:7015 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747
lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
jfs_umount+0x2ef/0x3c0 fs/jfs/jfs_umount.c:114
jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x134/0x2b0 fs/super.c:693
kill_block_super+0x44/0x90 fs/super.c:1660
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x43b/0x4d0 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd62ed9e097
RSP: 002b:00007ffd5d7b2298 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fd62ee321ca RCX: 00007fd62ed9e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd5d7b2350
RBP: 00007ffd5d7b2350 R08: 00007ffd5d7b3350 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd5d7b33e0
R13: 00007fd62ee321ca R14: 0000000000035103 R15: 00007ffd5d7b3420
INFO: task syz-executor:7138 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21736 pid:7138 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747
lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
jfs_umount+0x2ef/0x3c0 fs/jfs/jfs_umount.c:114
jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x134/0x2b0 fs/super.c:693
kill_block_super+0x44/0x90 fs/super.c:1660
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x43b/0x4d0 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc03239e097
RSP: 002b:00007ffee1ca9ef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fc0324321ca RCX: 00007fc03239e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffee1ca9fb0
RBP: 00007ffee1ca9fb0 R08: 00007ffee1caafb0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffee1cab040
R13: 00007fc0324321ca R14: 000000000003723c R15: 00007ffee1cab080
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by kworker/u4:5/1088:
#0: ffff888140e99938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888140e99938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900046ffd00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900046ffd00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
1 lock held by klogd/5133:
#0: ffff8880b8f3c098 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
2 locks held by getty/5535:
#0: ffff888031be00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217
2 locks held by syz-executor/5776:
#0: ffff88807f0ac0e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807f0ac0e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807f0ac0e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54b2e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
1 lock held by syz.2.71/6156:
#0: ffff88807f0ac0e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88807f0ac0e0 (&type->s_umount_key#52){++++}-{3:3}, at: super_lock+0x17f/0x3a0 fs/super.c:117
2 locks held by syz-executor/6877:
#0: ffff888025f740e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff888025f740e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff888025f740e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54b2e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/7004:
#0: ffff8880818380e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880818380e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880818380e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54b2e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/7015:
#0: ffff888080f1a0e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff888080f1a0e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff888080f1a0e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54b2e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/7138:
#0: ffff88801eee80e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88801eee80e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88801eee80e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54b2e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/7157:
#0: ffff88807a0ea0e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807a0ea0e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807a0ea0e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54b2e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/7562:
#0: ffff88807e7f20e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807e7f20e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807e7f20e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54b2e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/7721:
#0: ffff8880829600e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880829600e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880829600e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54b2e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/8325:
#0: ffff8880355500e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880355500e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880355500e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1:
ffffffff8d54b2e8
(
jfs_log_mutex
){+.+.}-{3:3}
, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/8394:
#0: ffff8880309ca0e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880309ca0e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880309ca0e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54b2e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf3d/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5771 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__free_one_page+0x301/0xc30 mm/page_alloc.c:846
Code: 04 30 84 c0 0f 85 9d 00 00 00 83 3b 00 0f 85 ca 07 00 00 4d 85 ff 0f 84 76 02 00 00 41 83 fc 09 74 3a 4c 89 ff 48 8b 74 24 20 <44> 89 e2 e8 07 fa ff ff 4c 89 eb 48 21 eb 48 89 d8 48 29 e8 48 c1
RSP: 0018:ffffc9000450fa60 EFLAGS: 00000093
RAX: 0000000000000000 RBX: ffffea00011e5274 RCX: ffffffff81d2e973
RDX: 0000000000000000 RSI: ffff88813fffa700 RDI: ffffea00011e5240
RBP: 0000000000047948 R08: ffffea00011e5277 R09: 1ffffd400023ca4e
R10: dffffc0000000000 R11: fffff9400023ca4f R12: 0000000000000000
R13: 0000000000047949 R14: dffffc0000000000 R15: ffffea00011e5240
FS: 00007f5309f4b880(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5309f43000 CR3: 000000007b4cf000 CR4: 00000000003506e0
Call Trace:
free_pcppages_bulk+0x306/0x5d0 mm/page_alloc.c:1279
free_unref_page+0x17e/0x2e0 mm/page_alloc.c:2481
__slab_free+0x35a/0x400 mm/slub.c:3736
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x11a/0x2d0 mm/slub.c:3519
getname_flags+0xbb/0x500 fs/namei.c:140
user_path_at_empty+0x2c/0x60 fs/namei.c:2916
do_readlinkat+0xdd/0x490 fs/stat.c:494
__do_sys_readlink fs/stat.c:527 [inline]
__se_sys_readlink fs/stat.c:524 [inline]
__x64_sys_readlink+0x7f/0x90 fs/stat.c:524
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f530a0453a7
Code: 00 00 90 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 00 31 c9 e8 8a 20 f9 ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 21 ba 0d 00 f7 d8 64 89 02 48
RSP: 002b:00007ffd44fc39f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffd44fc3ed0 RCX: 00007f530a0453a7
RDX: 0000000000000400 RSI: 00007ffd44fc3a00 RDI: 00007ffd44fc3ed0
RBP: 00007ffd44fc3a00 R08: 0000000000000075 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000400
R13: 00007ffd44fc5bd0 R14: 00007ffd44fc57d0 R15: 00007ffd44fc53d0