INFO: task syz-executor:7215 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:22560 pid:7215 tgid:7215 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14fb/0x52c0 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7285
rt_mutex_slowlock_block+0x508/0x680 kernel/locking/rtmutex.c:1647
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline]
rt_mutex_slowlock+0x2dc/0x7b0 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
__mutex_lock_common kernel/locking/rtmutex_api.c:534 [inline]
mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:552
lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
jfs_umount+0x2ef/0x3c0 fs/jfs/jfs_umount.c:114
jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x13d/0x2d0 fs/super.c:646
kill_block_super+0x44/0x90 fs/super.c:1725
deactivate_locked_super+0xbc/0x130 fs/super.c:476
cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f24165ed897
RSP: 002b:00007ffc7e15b018 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f24165ed897
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc7e15b0d0
RBP: 00007ffc7e15b0d0 R08: 00007ffc7e15c0d0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc7e15c160
R13: 00007f2416681ef0 R14: 000000000004a1f7 R15: 00007ffc7e15c1a0
Showing all locks held in the system:
1 lock held by khungtaskd/37:
#0: ffffffff8ddcd780 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8ddcd780 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8ddcd780 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
1 lock held by dhcpcd/5462:
#0: ffffffff8f1597f8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#0: ffffffff8f1597f8 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x32b/0x1b30 net/ipv4/devinet.c:1120
2 locks held by getty/5556:
#0: ffff8880322ad0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e832e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13c0 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/7075:
#0: ffff88802996a0d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88802996a0d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88802996a0d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24e7d8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/7215:
#0: ffff8880384860d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880384860d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff8880384860d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24e7d8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/7447:
#0: ffff88805fc6c0d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88805fc6c0d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88805fc6c0d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24e7d8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/7524:
#0: ffff888038d140d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888038d140d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff888038d140d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24e7d8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/8087:
#0: ffff88803d1680d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88803d1680d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88803d1680d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24e7d8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz.6.310/8750:
#0: ffff88804e6ee0d0 (&type->s_umount_key#87/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xac0 fs/super.c:345
#1: ffffffff8e24e7d8 (jfs_log_mutex){+.+.}-{4:4}, at: open_dummy_log fs/jfs/jfs_logmgr.c:1191 [inline]
#1: ffffffff8e24e7d8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogOpen+0x1a1/0xfa0 fs/jfs/jfs_logmgr.c:1066
6 locks held by kworker/u8:0/8779:
1 lock held by syz.3.332/8896:
#0: ffff88802996a0d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff88802996a0d0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
9 locks held by syz-executor/9519:
2 locks held by syz.5.451/9612:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [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:346 [inline]
watchdog+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 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: 8779 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: bat_events batadv_dat_purge
RIP: 0010:__migrate_disable include/linux/sched.h:2447 [inline]
RIP: 0010:migrate_disable include/linux/sched.h:2469 [inline]
RIP: 0010:__rt_spin_lock kernel/locking/spinlock_rt.c:51 [inline]
RIP: 0010:rt_spin_lock+0x26c/0x400 kernel/locking/spinlock_rt.c:57
Code: f6 49 81 c4 80 04 00 00 4d 89 e7 49 c1 ef 03 43 0f b6 04 2f 84 c0 0f 85 1a 01 00 00 66 41 83 3c 24 00 74 1a 0f 88 b8 00 00 00 <43> 0f b6 04 2f 84 c0 0f 85 21 01 00 00 66 41 ff 04 24 eb 59 bf 01
RSP: 0018:ffffc90004d6f9c0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 1ffff920009adf3c RCX: 0000000080000001
RDX: 00000000982dd245 RSI: ffffffff8ba643e0 RDI: ffffffff8ba643a0
RBP: ffffc90004d6fa78 R08: ffffffff8b241250 R09: ffffffff8ddcd780
R10: dffffc0000000000 R11: fffffbfff1ed44b7 R12: ffff88801dfb0480
R13: dffffc0000000000 R14: ffff88805cab4600 R15: 1ffff11003bf6090
FS: 0000000000000000(0000) GS:ffff888126343000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff34082e001 CR3: 000000008fbbc000 CR4: 00000000003526f0
Call Trace:
spin_lock_bh include/linux/spinlock_rt.h:90 [inline]
__batadv_dat_purge+0x131/0x400 net/batman-adv/distributed-arp-table.c:173
batadv_dat_purge+0x20/0x70 net/batman-adv/distributed-arp-table.c:204
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245