INFO: task syz-executor:9881 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20960 pid:9881 tgid:9881 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5352 [inline]
__schedule+0x1665/0x5590 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7047 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7062
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7119
__mutex_lock_common kernel/locking/mutex.c:710 [inline]
__mutex_lock+0x84b/0x1420 kernel/locking/mutex.c:794
lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1441
jfs_umount+0x2fb/0x3d0 fs/jfs/jfs_umount.c:124
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:238 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [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: 0033:0x7fc26919d9d7
RSP: 002b:00007fffca2b0ef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fc269232050 RCX: 00007fc26919d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffca2b0fb0
RBP: 00007fffca2b0fb0 R08: 00007fffca2b1fb0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffca2b2040
R13: 00007fc269232050 R14: 000000000004e76a R15: 00007fffca2b2080
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e75d6a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e75d6a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e75d6a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
5 locks held by kworker/u8:2/35:
5 locks held by kworker/u8:4/58:
2 locks held by kworker/u8:9/3505:
2 locks held by getty/5601:
#0: ffff8880378970a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/6402:
#0: ffff888059bfa0d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888059bfa0d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff888059bfa0d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8ebf28a0 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1441
2 locks held by syz-executor/9327:
#0: ffff888035d920d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888035d920d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff888035d920d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8ebf28a0 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1441
2 locks held by syz-executor/9447:
#0: ffff88806e0fa0d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88806e0fa0d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88806e0fa0d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8ebf28a0 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1441
2 locks held by syz-executor/9881:
#0: ffff88807f96c0d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88807f96c0d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88807f96c0d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8ebf28a0 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1441
2 locks held by syz-executor/10512:
#0: ffff8880580e80d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880580e80d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff8880580e80d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8ebf28a0 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1441
1 lock held by dhcpcd/14312:
#0: ffff88803a265040 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#0: ffff88803a265040 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:724
1 lock held by syz.5.2826/16631:
#0: ffff888059bfa0d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888059bfa0d8 (&type->s_umount_key#94){+.+.}-{4:4}, at: super_lock+0x289/0x3d0 fs/super.c:122
3 locks held by syz-executor/17337:
#0: ffffffff8fbd5d80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8fbd5d80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff8fbd5d80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0 net/core/rtnetlink.c:4071
#1: ffff888064e6d510 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x227/0x420 drivers/net/wireguard/device.c:50
#2: ffffffff8e7638e8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#2: ffffffff8e7638e8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961
5 locks held by sed/17722:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
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:162 [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+0x1002/0x1060 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
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: 5827 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:erase_dst_trace_buffer net/core/dst.c:89 [inline]
RIP: 0010:dst_destroy+0x2bb/0x570 net/core/dst.c:197
Code: 48 c7 04 ed 00 fa e0 9a 00 00 00 00 48 81 fd d0 7f 01 00 74 20 e8 25 db 3f f8 49 81 c4 80 01 00 00 48 83 c5 30 41 80 3c 2f 00 <0f> 85 44 ff ff ff e9 47 ff ff ff 4d 8d 66 38 4c 89 e0 48 c1 e8 03
RSP: 0018:ffffc90000007d90 EFLAGS: 00000246
RAX: ffffffff8986d7fb RBX: 1ffff11006867ac9 RCX: ffff8880721abd00
RDX: 0000000000000100 RSI: 0000000000000018 RDI: 0000000000000002
RBP: 0000000000012ba0 R08: ffff88807faae62b R09: 1ffff1100ff55cc5
R10: dffffc0000000000 R11: ffffed100ff55cc6 R12: ffffffff9aea5640
R13: ffffffff9aea5580 R14: ffff88803433d640 R15: fffffbfff35c1f28
FS: 000055555760e540(0000) GS:ffff888125435000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a31869b660 CR3: 0000000077448000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
handle_softirqs+0x22a/0x870 kernel/softirq.c:626
do_softirq+0x76/0xd0 kernel/softirq.c:523
__local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
tcp_recvmsg+0x210/0x7e0 net/ipv4/tcp.c:2962
sock_recvmsg_nosec+0xee/0x140 net/socket.c:1151
sock_recvmsg net/socket.c:1173 [inline]
sock_read_iter+0x296/0x360 net/socket.c:1243
new_sync_read fs/read_write.c:493 [inline]
vfs_read+0x582/0xa70 fs/read_write.c:574
ksys_read+0x150/0x270 fs/read_write.c:717
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe82f957917
Code: 48 89 fa 4c 89 df e8 a8 56 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffd2197fbd0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000055555760e540 RCX: 00007fe82f957917
RDX: 0000000000000004 RSI: 00007ffd2197fc2c RDI: 0000000000000003
RBP: 00007ffd219800d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
R13: 00007ffd2197fc2c R14: 00007ffd2197fcc0 R15: 0000000000000000