syzbot

INFO: task syz.5.22:6267 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.22        state:D stack:28808 pid:6267  tgid:6266  ppid:6205   task_flags:0x480040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1295/0x67a0 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7283
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7340
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0xced/0x1b10 kernel/locking/mutex.c:820
 blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
 blk_debugfs_lock block/blk.h:770 [inline]
 blk_trace_setup+0x1f2/0x440 kernel/trace/blktrace.c:788
 blk_trace_ioctl+0x245/0x320 kernel/trace/blktrace.c:937
 blkdev_ioctl+0x17c/0x6f0 block/ioctl.c:786
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f15b679ce59
RSP: 002b:00007f15b76cb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f15b6a15fa0 RCX: 00007f15b679ce59
RDX: 00002000000000c0 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f15b6832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f15b6a16038 R14: 00007f15b6a15fa0 R15: 00007ffd4ebfd548
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/0:0/9:
 #0: ffff88813fe57140 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12d6/0x1980 kernel/workqueue.c:3289
 #1: ffffc900000e7d08 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x973/0x1980 kernel/workqueue.c:3290
 #2: ffff888022a8f250 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1b8/0x63b0 drivers/net/netdevsim/fib.c:1490
4 locks held by kworker/u8:1/13:
1 lock held by khungtaskd/31:
 #0: ffffffff8e7e53e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffffffff8e7e53e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff8e7e53e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
2 locks held by getty/5396:
 #0: ffff8880381500a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14f0 drivers/tty/n_tty.c:2211
3 locks held by syz-execprog/5676:
7 locks held by syz.4.21/6202:
1 lock held by syz.5.22/6267:
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock block/blk.h:770 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x1f2/0x440 kernel/trace/blktrace.c:788
1 lock held by syz.6.23/6424:
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock block/blk.h:770 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x1f2/0x440 kernel/trace/blktrace.c:788
1 lock held by syz.7.24/6470:
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock block/blk.h:770 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x1f2/0x440 kernel/trace/blktrace.c:788
1 lock held by syz.8.25/6579:
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock block/blk.h:770 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x1f2/0x440 kernel/trace/blktrace.c:788
1 lock held by syz.9.26/6691:
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock block/blk.h:770 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x1f2/0x440 kernel/trace/blktrace.c:788
1 lock held by syz.0.27/6772:
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock block/blk.h:770 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x1f2/0x440 kernel/trace/blktrace.c:788
1 lock held by syz.1.28/7026:
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock block/blk.h:770 [inline]
 #0: ffff888026f1ade8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x1f2/0x440 kernel/trace/blktrace.c:788
1 lock held by syz-executor/7188:
 #0: ffffffff8e7f0f28 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x27f/0x3c0 kernel/rcu/tree_exp.h:311
4 locks held by dhcpcd-run-hook/7288:

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x1d7/0x230 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+0x141/0x190 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xcb1/0x1030 kernel/hung_task.c:561
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6590 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:__sanitizer_cov_trace_switch+0x3b/0x90 kernel/kcov.c:351
Code: 53 48 8b 46 08 48 83 f8 20 74 63 77 48 48 83 f8 08 74 63 41 be 03 00 00 00 48 83 f8 10 75 29 4c 8b 6d 00 31 db 4d 85 ed 74 1e <48> 8b 74 dd 10 48 8b 4c 24 28 4c 89 e2 4c 89 f7 48 83 c3 01 e8 8c
RSP: 0018:ffffc90002ea75a8 EFLAGS: 00000212
RAX: 0000000000000000 RBX: 000000000000000d RCX: ffffffff8b0b3032
RDX: 0000000000000032 RSI: 000000000000005a RDI: ffff888034371f00
RBP: ffffffff8d1cdfe0 R08: 0000000000000001 R09: 000000000000005a
R10: 0000000000000032 R11: ffff8881bf1c6000 R12: 0000000000000032
R13: 0000000000000020 R14: 0000000000000001 R15: ffff8881d7610d8d
FS:  0000000000000000(0000) GS:ffff88812438a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f47854ac4e8 CR3: 000000022f922000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 _ieee802_11_parse_elems_full+0x2f2/0x4d60 net/mac80211/parse.c:355
 ieee802_11_parse_elems_full+0x1175/0x37f0 net/mac80211/parse.c:1120
 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2518 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1565 [inline]
 ieee80211_ibss_rx_queued_mgmt+0xc8d/0x2f80 net/mac80211/ibss.c:1596
 ieee80211_iface_process_skb net/mac80211/iface.c:1795 [inline]
 ieee80211_iface_work+0xbff/0x13e0 net/mac80211/iface.c:1849
 cfg80211_wiphy_work+0x410/0x570 net/wireless/core.c:513
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>