syzbot

INFO: task syz.1.6722:12129 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.6722      state:D stack:25808 pid:12129 tgid:12129 ppid:10777  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0xef5/0x5750 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 schedule_timeout+0x258/0x2a0 kernel/time/timer.c:2591
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common+0x3e1/0x600 kernel/sched/completion.c:116
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:264
 coredump_wait fs/coredump.c:418 [inline]
 do_coredump+0x82f/0x4160 fs/coredump.c:575
 get_signal+0x237c/0x26d0 kernel/signal.c:2902
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 irqentry_exit_to_user_mode+0x13f/0x280 kernel/entry/common.c:231
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7ff451345a7c
RSP: 002b:00007ffd3cc3d1f8 EFLAGS: 00010202
RAX: 0000000020000000 RBX: 0000000000000004 RCX: 8000000000000014
RDX: 0000000000000014 RSI: 00007ff450e0032b RDI: 0000000020000000
RBP: 00007ff451535f8c R08: 00007ff451200000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000009 R12: 0000000000000000
R13: 00007ff451535f80 R14: 0000000000000003 R15: fffffffffffffffe
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720
3 locks held by kworker/u8:3/52:
 #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1212/0x1b30 kernel/workqueue.c:3204
 #1: ffffc90000bd7d80 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3205
 #2: ffffffff8fac4128 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0x51/0xc0 net/core/link_watch.c:276
1 lock held by dhcpcd/4900:
 #0: ffffffff8fac4128 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x1c1/0x1e10 net/ipv4/devinet.c:1097
2 locks held by getty/4997:
 #0: ffff88814d1a80a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
3 locks held by kworker/u8:16/6268:
4 locks held by kworker/u8:34/7240:
 #0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x1212/0x1b30 kernel/workqueue.c:3204
 #1: ffffc9000464fd80 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3205
 #2: ffffffff8faae510 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xbb/0xb40 net/core/net_namespace.c:580
 #3: ffffffff8fac4128 (rtnl_mutex){+.+.}-{3:3}, at: wiphy_unregister+0x13e/0xc10 net/wireless/core.c:1100
4 locks held by kworker/0:2/32561:
 #0: ffff8880b863ee98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:593
 #1: ffff8880b8628a48 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2c1/0x8e0 kernel/sched/psi.c:987
 #2: ffff8880b862b918 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5d/0x220 kernel/time/timer.c:1051
 #3: ffffffff9a5df1c8 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x199/0x540 lib/debugobjects.c:708
1 lock held by syz.2.5777/7062:
1 lock held by syz-executor/10672:
2 locks held by syz.0.6568/11410:
1 lock held by syz.1.6722/12139:
2 locks held by syz-executor/13230:
2 locks held by syz.0.6953/13352:
2 locks held by syz.0.7009/13735:
2 locks held by syz.0.7012/13757:
2 locks held by syz.3.7034/13851:
1 lock held by syz-executor/13922:
 #0: ffffffff8fac4128 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fac4128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x372/0xea0 net/core/rtnetlink.c:6672
2 locks held by syz.2.7057/13938:
 #0: ffffffff8fac4128 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 #0: ffffffff8fac4128 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x38/0x230 drivers/net/tun.c:3517
 #1: ffffffff8ddc30f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:297
2 locks held by syz-executor/13987:
 #0: ffffffff8faae510 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x292/0x6b0 net/core/net_namespace.c:490
 #1: ffffffff8fac4128 (rtnl_mutex){+.+.}-{3:3}, at: wg_netns_pre_exit+0x1b/0x230 drivers/net/wireguard/device.c:414
2 locks held by syz.3.7061/13995:
3 locks held by syz.3.7061/13999:
2 locks held by syz.0.7072/14033:
 #0: ffffffff8faae510 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x292/0x6b0 net/core/net_namespace.c:490
 #1: ffffffff8fac4128 (rtnl_mutex){+.+.}-{3:3}, at: ip_tunnel_init_net+0x1b0/0x6e0 net/ipv4/ip_tunnel.c:1159
2 locks held by syz.3.7074/14056:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xf0c/0x1240 kernel/hung_task.c:379
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 18463 Comm: kworker/u8:25 Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
RIP: 0010:atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4457 [inline]
RIP: 0010:__mutex_trylock_common+0x94/0x250 kernel/locking/mutex.c:129
Code: 48 c7 44 24 30 00 00 00 00 e8 38 54 85 00 48 89 d8 48 c1 e8 03 65 4c 8b 35 f9 26 9b 7e 80 3c 28 00 0f 85 98 01 00 00 48 8b 03 <4c> 8d 7c 24 30 48 89 44 24 30 48 8b 44 24 30 48 89 c5 49 89 c5 83
RSP: 0018:ffffc9000310faa0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888058238700 RCX: ffffffff8168b4b8
RDX: ffffed100b0470e1 RSI: 0000000000000008 RDI: ffff888058238700
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffed100b0470e0
R10: ffff888058238707 R11: 0000000000000000 R12: 1ffff92000621f56
R13: 0000000000000002 R14: ffff88801e720000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e91cff8 CR3: 000000006ab5c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __mutex_trylock kernel/locking/mutex.c:152 [inline]
 __mutex_lock_common kernel/locking/mutex.c:611 [inline]
 __mutex_lock+0x18c/0x9c0 kernel/locking/mutex.c:752
 wiphy_lock include/net/cfg80211.h:6014 [inline]
 cfg80211_wiphy_work+0x9e/0x550 net/wireless/core.c:426
 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>