INFO: task syz-executor:13443 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:21064 pid:13443 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+0x61/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7efda399da57 RSP: 002b:00007ffc03f2ed88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007efda3a32048 RCX: 00007efda399da57 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc03f2ee40 RBP: 00007ffc03f2ee40 R08: 00007ffc03f2fe40 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc03f2fed0 R13: 00007efda3a32048 R14: 00000000000e5cd4 R15: 00007ffc03f2ff10 Showing all locks held in the system: 1 lock held by khungtaskd/28: #0: ffffffff8d1320a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8d1320a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8d1320a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633 2 locks held by dhcpcd/5432: #0: ffff88807dba0690 (nlk_cb_mutex-ROUTE){+.+.}-{3:3}, at: __netlink_dump_start+0xf4/0x810 net/netlink/af_netlink.c:2336 #1: ffffffff8e3c2748 (rtnl_mutex){+.+.}-{3:3}, at: netlink_dump+0x78f/0xe50 net/netlink/af_netlink.c:2263 2 locks held by getty/5523: #0: ffff8880211600a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000327e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217 2 locks held by syz-executor/5767: #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513 #1: ffffffff8d54a068 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 3 locks held by kworker/1:3/5769: #0: ffff888017c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline] #0: ffff888017c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730 #1: ffffc900046efd00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline] #1: ffffc900046efd00 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730 #2: ffffffff8e3c2748 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104 3 locks held by kworker/u4:26/5934: #0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline] #0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730 #1: ffffc90004e27d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline] #1: ffffc90004e27d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730 #2: ffffffff8e3c2748 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:286 4 locks held by kworker/u4:28/5938: 4 locks held by kworker/u4:39/5969: 2 locks held by kworker/u4:44/5983: 2 locks held by syz-executor/13443: #0: ffff888078b2c0e0 (&type->s_umount_key#93){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff888078b2c0e0 (&type->s_umount_key#93){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff888078b2c0e0 (&type->s_umount_key#93){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513 #1: ffffffff8d54a068 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 3 locks held by kworker/0:8/13635: #0: ffff888017c71d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline] #0: ffff888017c71d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730 #1: ffffc900043cfd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline] #1: ffffc900043cfd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730 #2: ffffffff8e3c2748 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x92/0xd90 net/wireless/reg.c:2463 1 lock held by syz.7.1624/15287: #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: super_lock+0x17f/0x3a0 fs/super.c:117 1 lock held by syz.7.1624/15290: #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: super_lock+0x17f/0x3a0 fs/super.c:117 1 lock held by syz.7.1624/15291: #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: super_lock+0x17f/0x3a0 fs/super.c:117 1 lock held by syz.7.1624/15292: #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: super_lock+0x17f/0x3a0 fs/super.c:117 1 lock held by syz.7.1624/15293: #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: super_lock+0x17f/0x3a0 fs/super.c:117 1 lock held by syz.7.1624/15297: #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: super_lock+0x17f/0x3a0 fs/super.c:117 1 lock held by syz.7.1624/15298: #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807b7980e0 (&type->s_umount_key#93){++++}-{3:3}, at: super_lock+0x17f/0x3a0 fs/super.c:117 1 lock held by syz-executor/15307: 1 lock held by syz-executor/16774: #0: ffffffff8e3c2748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline] #0: ffffffff8e3c2748 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6472 6 locks held by syz.9.2026/16915: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7181 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:__sanitizer_cov_trace_switch+0x81/0x120 kernel/kcov.c:349 Code: 00 00 00 b9 01 00 00 00 48 85 c0 0f 84 ae 00 00 00 41 57 41 56 41 54 53 48 8b 54 24 20 65 4c 8b 05 84 8e 7c 7e 45 31 c9 eb 08 <49> ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 65 44 8b 1d 72 8e 7c 7e 41 RSP: 0018:ffffc9000466f3b0 EFLAGS: 00000293 RAX: 0000000000000003 RBX: ffffffff8f11e090 RCX: 0000000000000003 RDX: ffffffff813b4e99 RSI: ffffffff8cfa0820 RDI: 0000000000000001 RBP: ffffc9000466f4f8 R08: ffff888029d50000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000466f4a8 R13: dffffc0000000000 R14: 0000000000000001 R15: ffffffff8f11e094 FS: 000055555a6df500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555a6df4e8 CR3: 0000000065012000 CR4: 00000000003506f0 Call Trace: unwind_next_frame+0x16d9/0x2970 arch/x86/kernel/unwind_orc.c:641 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 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 kmem_cache_zalloc include/linux/slab.h:711 [inline] lsm_file_alloc security/security.c:613 [inline] security_file_alloc+0x34/0x120 security/security.c:2604 init_file+0x94/0x1f0 fs/file_table.c:161 alloc_empty_file+0xb7/0x1d0 fs/file_table.c:210 path_openat+0x113/0x3230 fs/namei.c:3783 do_filp_open+0x1f5/0x430 fs/namei.c:3824 do_sys_openat2+0x134/0x1d0 fs/open.c:1421 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1447 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f0b11b9bb3c Code: 4c 89 54 24 18 41 89 f2 41 83 e2 40 75 40 89 f0 f7 d0 a9 00 00 41 00 74 35 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05 <48> 3d 00 f0 ff ff 77 44 48 8b 54 24 18 64 48 2b 14 25 28 00 00 00 RSP: 002b:00007ffd86a742a0 EFLAGS: 00000206 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f0b11c32048 RCX: 00007f0b11b9bb3c RDX: 0000000000090800 RSI: 00007ffd86a75450 RDI: 00000000ffffff9c RBP: 00007ffd86a7543c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffd86a75450 R13: 00007f0b11c32048 R14: 0000000000117f32 R15: 00007ffd86a75490