syzbot


INFO: task hung in ep_clear_and_put

Status: auto-obsoleted due to no activity on 2024/10/10 13:07
Subsystems: kernfs
[Documentation on labels]
First crash: 246d, last: 216d

Sample crash report:
INFO: task syz.4.26:5302 blocked for more than 147 seconds.
      Not tainted 6.10.0-rc7-syzkaller-00139-g8a18fda0febb #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.26        state:D
 stack:22656 pid:5302  tgid:5302  ppid:5091   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 ep_clear_and_put+0xc5/0x300 fs/eventpoll.c:877
 ep_eventpoll_release+0x48/0x60 fs/eventpoll.c:937
 __fput+0x24c/0x8a0 fs/file_table.c:422
 task_work_run+0x251/0x310 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x360 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f99d2f75bd9
RSP: 002b:00007ffd5e6d6f78 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f99d3105a60 RCX: 00007f99d2f75bd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f99d3105a60 R08: 0000000000000006 R09: 0000000b5e6d729f
R10: 00000000003ffab8 R11: 0000000000000246 R12: 0000000000019115
R13: 0000000000000bea R14: 00007f99d3105a60 R15: 00007f99d31041e8
 </TASK>
INFO: task syz.4.26:5303 blocked for more than 148 seconds.
      Not tainted 6.10.0-rc7-syzkaller-00139-g8a18fda0febb #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.26        state:D
 stack:25904 pid:5303  tgid:5302  ppid:5091   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2557
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
 __synchronize_srcu+0x357/0x400 kernel/rcu/srcutree.c:1396
 wakeup_source_remove drivers/base/power/wakeup.c:198 [inline]
 wakeup_source_unregister+0x115/0x190 drivers/base/power/wakeup.c:242
 __ep_remove+0x4f5/0x780 fs/eventpoll.c:845
 eventpoll_release_file+0xdb/0x1c0 fs/eventpoll.c:1107
 eventpoll_release include/linux/eventpoll.h:53 [inline]
 __fput+0x6e0/0x8a0 fs/file_table.c:413
 task_work_run+0x251/0x310 kernel/task_work.c:180
 get_signal+0x15e6/0x1740 kernel/signal.c:2681
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f99d2f75bd9
RSP: 002b:00007f99d3da7048 EFLAGS: 00000246
 ORIG_RAX: 0000000000000133
RAX: 000000000000000b RBX: 00007f99d3103f60 RCX: 00007f99d2f75bd9
RDX: 0000000000000318 RSI: 00000000200bd000 RDI: 0000000000000005
RBP: 00007f99d2fe4e60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f99d3103f60 R15: 00007ffd5e6d6e98
 </TASK>
INFO: task syz.4.26:5304 blocked for more than 149 seconds.
      Not tainted 6.10.0-rc7-syzkaller-00139-g8a18fda0febb #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.26        state:D stack:25872 pid:5304  tgid:5302  ppid:5091   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2557
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
 __synchronize_srcu+0x357/0x400 kernel/rcu/srcutree.c:1396
 wakeup_source_remove drivers/base/power/wakeup.c:198 [inline]
 wakeup_source_unregister+0x115/0x190 drivers/base/power/wakeup.c:242
 __ep_remove+0x4f5/0x780 fs/eventpoll.c:845
 ep_remove_safe fs/eventpoll.c:864 [inline]
 ep_clear_and_put+0x156/0x300 fs/eventpoll.c:900
 ep_eventpoll_release+0x48/0x60 fs/eventpoll.c:937
 __fput+0x24c/0x8a0 fs/file_table.c:422
 task_work_run+0x251/0x310 kernel/task_work.c:180
 get_signal+0x15e6/0x1740 kernel/signal.c:2681
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f99d2f75bd9
RSP: 002b:00007f99d3d86048 EFLAGS: 00000246
 ORIG_RAX: 000000000000010f
RAX: 0000000000000001 RBX: 00007f99d3104038 RCX: 00007f99d2f75bd9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000020000200
RBP: 00007f99d2fe4e60 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f99d3104038 R15: 00007ffd5e6d6e98
 </TASK>

Showing all locks held in the system:
9 locks held by kworker/0:0/8:
3 locks held by kworker/0:1/9:
1 lock held by khungtaskd/30:
 #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
3 locks held by kworker/u8:2/35:
 #0: ffff88802a74b948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline]
 #0: ffff88802a74b948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: 
ffffc90000ab7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline]
ffffc90000ab7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
 #2: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4733
2 locks held by kworker/0:2/927:
2 locks held by kworker/u8:7/1101:
 #0: ffff888015081148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline]
 #0: ffff888015081148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: 
ffffc90004427d00 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline]
ffffc90004427d00 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
6 locks held by kworker/u8:8/2412:
 #0: ffff888015ed5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline]
 #0: ffff888015ed5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: ffffc90009147d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline]
 #1: ffffc90009147d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
 #2: ffffffff8f5ddf10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594
 #3: ffff8880604d30e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline]
 #3: ffff8880604d30e8 (&dev->mutex){....}-{3:3}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline]
 #3: ffff8880604d30e8 (&dev->mutex){....}-{3:3}, at: devlink_pernet_pre_exit+0x13b/0x440 net/devlink/core.c:506
 #4: 
ffff8880604d4250 (&devlink->lock_key#4){+.+.}-{3:3}, at: devl_lock net/devlink/core.c:276 [inline]
ffff8880604d4250 (&devlink->lock_key#4){+.+.}-{3:3}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline]
ffff8880604d4250 (&devlink->lock_key#4){+.+.}-{3:3}, at: devlink_pernet_pre_exit+0x14d/0x440 net/devlink/core.c:506
 #5: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x71/0x5c0 drivers/net/netdevsim/netdev.c:773
2 locks held by getty/4850:
 #0: 
ffff88802b0bf0a0
 (&tty->ldisc_sem
){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211
3 locks held by kworker/1:4/5096:
 #0: ffff888015078948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline]
 #0: ffff888015078948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: ffffc900049c7d00
 (reg_work
){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline]
){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
 #2: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: reg_todo+0x1c/0x8d0 net/wireless/reg.c:3216
5 locks held by kworker/0:3/5141:
4 locks held by udevd/5154:
 #0: ffff88807c9d62f0
 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xb7/0xd60 fs/seq_file.c:182
 #1: ffff88802a4f2488 (&of->mutex#2){+.+.}-{3:3}, at: kernfs_seq_start+0x53/0x3b0 fs/kernfs/file.c:154
 #2: ffff88802d26d0f8 (kn->active#18){.+.+}-{0:0}, at: kernfs_seq_start+0x72/0x3b0 fs/kernfs/file.c:155
 #3: ffff88802b013190 (&dev->mutex){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:1014 [inline]
 #3: ffff88802b013190 (&dev->mutex){....}-{3:3}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
3 locks held by kworker/1:5/5156:
 #0: ffff888015079948 ((wq_completion)events_power_efficient){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3223 [inline]
, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: 
ffffc9000304fd00
 (
(reg_check_chans).work
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3224 [inline]
, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
 #2: ffffffff8f5ea748
 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x91/0xea0 net/wireless/reg.c:2478
2 locks held by kworker/0:5/5158:
3 locks held by kworker/1:8/5162:
 #0: 
ffff888015078948
 ((wq_completion)events
){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline]
){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: ffffc90004437d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline]
 #1: ffffc90004437d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
 #2: ffffffff8f5ea748
 (rtnl_mutex
){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
2 locks held by kworker/0:7/5223:
1 lock held by syz.4.26/5302:
 #0: 
ffff888079165468 (&ep->mtx){+.+.}-{3:3}, at: ep_clear_and_put+0xc5/0x300 fs/eventpoll.c:877
1 lock held by syz.4.26/5303:
 #0: 
ffff888079165468
 (
&ep->mtx){+.+.}-{3:3}
, at: eventpoll_release_file+0xcb/0x1c0 fs/eventpoll.c:1106
1 lock held by syz.4.26/5304:
 #0: 
ffff888079164868
 (
&ep->mtx){+.+.}-{3:3}, at: ep_clear_and_put+0xc5/0x300 fs/eventpoll.c:877
1 lock held by syz.2.27/5315:
1 lock held by syz.5.29/5322:
 #0: ffff88802f5abc68 (&ep->mtx){+.+.}-{3:3}
, at: ep_clear_and_put+0xc5/0x300 fs/eventpoll.c:877
2 locks held by kworker/u8:12/5329:
 #0: ffff888015081148
 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline]
 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: ffffc90002d3fd00 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline]
 #1: ffffc90002d3fd00 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
1 lock held by syz-executor/5337:
 #0: ffffffff8f5ea748
 (
rtnl_mutex
){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3500
2 locks held by syz-executor/5340:
 #0: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 #0: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3500
 #1: ffffffff8e1ce5b0 (cpu_hotplug_lock){++++}-{0:0}, at: flush_all_backlogs net/core/dev.c:5984 [inline]
 #1: ffffffff8e1ce5b0 (cpu_hotplug_lock){++++}-{0:0}, at: unregister_netdevice_many_notify+0x607/0x16b0 net/core/dev.c:11201
1 lock held by syz-executor/5341:
 #0: 
ffffffff8f5ea748
 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3500
1 lock held by syz-executor/5346:
 #0: ffffffff8f5ea748
 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3500
1 lock held by syz-executor/5348:
 #0: 
ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3500
2 locks held by syz-executor/5386:
 #0: ffffffff8f5ddf10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8f5ea748
 (rtnl_mutex
){+.+.}-{3:3}, at: ip_tunnel_init_net+0x20e/0x710 net/ipv4/ip_tunnel.c:1159
2 locks held by syz-executor/5387:
 #0: 
ffffffff8f5ddf10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: 
ffffffff8f5ea748
 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3871
2 locks held by syz-executor/5390:
 #0: ffffffff8f5ddf10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3871
2 locks held by syz-executor/5391:
 #0: 
ffffffff8f5ddf10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3871
2 locks held by syz-executor/5394:
 #0: ffffffff8f5ddf10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3871
2 locks held by syz-executor/5393:
 #0: ffffffff8f5ddf10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: 
ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3871
1 lock held by syz-executor/5401:
 #0: ffffffff8f5ea748
 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632
1 lock held by syz-executor/5402:
 #0: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632
1 lock held by syz-executor/5405:
 #0: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632
1 lock held by syz-executor/5410:
 #0: 
ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632
1 lock held by syz-executor/5411:
 #0: 
ffffffff8f5ea748
 (
rtnl_mutex
){+.+.}-{3:3}
, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
, at: rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632
1 lock held by syz-executor/5413:
 #0: 
ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
ffffffff8f5ea748 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632

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

NMI backtrace for cpu 1
CPU: 1 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc7-syzkaller-00139-g8a18fda0febb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xfde/0x1020 kernel/hung_task.c:379
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/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:
gspca_pac7302 1-1:0.0: URB error -71, resubmitting
NMI backtrace for cpu 0
CPU: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.10.0-rc7-syzkaller-00139-g8a18fda0febb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: events kfree_rcu_monitor
RIP: 0010:io_serial_in+0x76/0xb0 drivers/tty/serial/8250/8250_port.c:406
Code: 20 01 5a fc 89 e9 41 d3 e6 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 f1 c6 bf fc 44 03 33 44 89 f2 ec <0f> b6 c0 5b 41 5e 41 5f 5d e9 d7 19 74 06 89 e9 80 e1 07 38 c1 7c
RSP: 0018:ffffc90000005ab8 EFLAGS: 00000002
RAX: 1ffffffff295a500 RBX: ffffffff94ad2ee0 RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff853c26f6 R09: 1ffff11003f37046
R10: dffffc0000000000 R11: ffffffff853c26b0 R12: dffffc0000000000
R13: 000000000000261e R14: 00000000000003fd R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002004a000 CR3: 000000000e132000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 serial_in drivers/tty/serial/8250/8250.h:117 [inline]
 serial_lsr_in drivers/tty/serial/8250/8250.h:139 [inline]
 wait_for_lsr drivers/tty/serial/8250/8250_port.c:2068 [inline]
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3315 [inline]
 serial8250_console_write+0x109b/0x1770 drivers/tty/serial/8250/8250_port.c:3393
 console_emit_next_record kernel/printk/printk.c:2913 [inline]
 console_flush_all+0x867/0xfd0 kernel/printk/printk.c:2979
 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3048
 vprintk_emit+0x5a6/0x770 kernel/printk/printk.c:2348
 _printk+0xd5/0x120 kernel/printk/printk.c:2373
 int_irq+0x1bd/0x250 drivers/media/usb/gspca/gspca.c:104
 __usb_hcd_giveback_urb+0x42e/0x6e0 drivers/usb/core/hcd.c:1650
 dummy_timer+0x830/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1987
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x59d/0xd50 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x3f0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1043
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200
Code: 89 fb e8 23 00 00 00 48 8b 3d ac da 45 0c 48 89 de 5b e9 93 4d 5a 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 c0 d4 03 00 65 8b 15 90 ac
RSP: 0018:ffffc90000006940 EFLAGS: 00000283
RAX: ffffffff9026a464 RBX: ffffffff9026a468 RCX: ffff888016eb5a00
RDX: 0000000080000302 RSI: ffffffff8b8632c5 RDI: ffffffff8b8632e0
RBP: ffffffff8b8632e0 R08: ffffffff8140f500 R09: ffffc90000006b10
R10: 0000000000000003 R11: ffffffff8181de00 R12: ffffffff9026a464
R13: ffffffff9026a45c R14: ffffffff8b8632c5 R15: ffffffff9026a458
 __orc_find arch/x86/kernel/unwind_orc.c:99 [inline]
 orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
 unwind_next_frame+0x531/0x2a00 arch/x86/kernel/unwind_orc.c:494
 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541
 kvfree_call_rcu+0xfc/0x790 kernel/rcu/tree.c:3781
 cfg80211_update_known_bss+0xb39/0x1500 net/wireless/scan.c:1862
 __cfg80211_bss_update+0x150/0x20c0 net/wireless/scan.c:1908
 cfg80211_inform_single_bss_data+0xfd6/0x2360 net/wireless/scan.c:2289
 cfg80211_inform_bss_data+0x3dd/0x5a70 net/wireless/scan.c:3117
 cfg80211_inform_bss_frame_data+0x3bc/0x720 net/wireless/scan.c:3207
 ieee80211_bss_info_update+0x8a7/0xbc0 net/mac80211/scan.c:226
 ieee80211_scan_rx+0x526/0x9c0 net/mac80211/scan.c:340
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5222 [inline]
 ieee80211_rx_list+0x2b00/0x3780 net/mac80211/rx.c:5459
 ieee80211_rx_napi+0x18a/0x3c0 net/mac80211/rx.c:5482
 ieee80211_rx include/net/mac80211.h:5093 [inline]
 ieee80211_handle_queued_frames+0xe7/0x1e0 net/mac80211/main.c:438
 tasklet_action_common+0x323/0x4d0 kernel/softirq.c:785
 handle_softirqs+0x2c6/0x970 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_get_return_address+0x5/0xc0 arch/x86/kernel/unwind_orc.c:365
Code: 24 40 8b 74 24 14 e9 dd fe ff ff e8 75 57 45 0a 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 53 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 d4 39 55
RSP: 0018:ffffc900000d7550 EFLAGS: 00000293
RAX: ffffffff813772df RBX: ffffffff81fbb39f RCX: ffff888016eb5a00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: ffffc900000d7560
RBP: ffffc900000d75f0 R08: ffffffff81410e65 R09: ffffffff8141095f
R10: 0000000000000003 R11: ffff888016eb5a00 R12: ffff888016eb5a00
R13: ffffffff8181de00 R14: ffffc900000d7640 R15: ffffc900000d7560
 arch_stack_walk+0x125/0x1b0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2196 [inline]
 slab_free_freelist_hook mm/slub.c:2225 [inline]
 slab_free_bulk mm/slub.c:4462 [inline]
 kmem_cache_free_bulk+0x1f8/0x370 mm/slub.c:4676
 kfree_bulk include/linux/slab.h:568 [inline]
 kvfree_rcu_bulk+0x24b/0x4e0 kernel/rcu/tree.c:3371
 kvfree_rcu_drain_ready kernel/rcu/tree.c:3545 [inline]
 kfree_rcu_monitor+0x8a4/0x1020 kernel/rcu/tree.c:3563
 process_one_work kernel/workqueue.c:3248 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3329
 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/07/12 12:59 upstream 8a18fda0febb eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in ep_clear_and_put
2024/06/12 14:18 upstream 2ef5971ff345 4d75f4f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in ep_clear_and_put
* Struck through repros no longer work on HEAD.