syzbot


INFO: task hung in cfg80211_event_work

Status: upstream: reported on 2023/01/21 03:03
Reported-by: syzbot+503793959188c709755a@syzkaller.appspotmail.com
First crash: 492d, last: 492d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in cfg80211_event_work (2) wireless C done 3 77d 319d 0/26 upstream: reported C repro on 2023/07/12 12:52
upstream INFO: task hung in cfg80211_event_work wireless C unreliable error 4 1226d 1259d 0/26 closed as invalid on 2022/02/08 10:49

Sample crash report:
ieee802154 phy0 wpan0: encryption failed: -22
ieee802154 phy1 wpan1: encryption failed: -22
Bluetooth: hci0: command 0x0409 tx timeout
Bluetooth: hci0: command 0x041b tx timeout
Bluetooth: hci0: command 0x040f tx timeout
INFO: task kworker/u4:0:7 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:0    D26584     7      2 0x80000000
Workqueue: cfg80211 cfg80211_event_work
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
 __mutex_lock_common kernel/locking/mutex.c:1016 [inline]
 __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078
 cfg80211_event_work+0xe/0x20 net/wireless/core.c:304
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
INFO: task kworker/1:2:3688 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:2     D26728  3688      2 0x80000000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
 __mutex_lock_common kernel/locking/mutex.c:1016 [inline]
 __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078
 addrconf_dad_work+0x9c/0x10a0 net/ipv6/addrconf.c:3989
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
INFO: task kworker/0:0:16005 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:0     D27264 16005      2 0x80000000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
 __mutex_lock_common kernel/locking/mutex.c:1016 [inline]
 __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078
 addrconf_dad_work+0x9c/0x10a0 net/ipv6/addrconf.c:3989
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Showing all locks held in the system:
3 locks held by kworker/u4:0/7:
 #0: 0000000088e85810 ((wq_completion)"cfg80211"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
 #1: 000000009c58b112 ((work_completion)(&rdev->event_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
 #2: 000000001744bc88 (rtnl_mutex){+.+.}, at: cfg80211_event_work+0xe/0x20 net/wireless/core.c:304
4 locks held by kworker/u4:2/33:
1 lock held by khungtaskd/1570:
 #0: 0000000069876cf5 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
3 locks held by kworker/1:2/3688:
 #0: 00000000640871bb ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
 #1: 000000002e197d14 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
 #2: 000000001744bc88 (rtnl_mutex){+.+.}, at: addrconf_dad_work+0x9c/0x10a0 net/ipv6/addrconf.c:3989
1 lock held by systemd-journal/4691:
3 locks held by systemd-udevd/4699:
1 lock held by in:imklog/7807:
 #0: 00000000bdd4659b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
3 locks held by syz-fuzzer/8125:
1 lock held by syz-fuzzer/9810:
 #0: 000000008baa4df6 (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline]
 #0: 000000008baa4df6 (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:85 [inline]
 #0: 000000008baa4df6 (&pipe->mutex/1){+.+.}, at: pipe_wait+0x1bd/0x1e0 fs/pipe.c:133
3 locks held by kworker/0:3/9291:
1 lock held by syz-executor.0/10662:
 #0: 000000001744bc88 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline]
 #0: 000000001744bc88 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323
1 lock held by syz-executor.4/10750:
2 locks held by kworker/u4:8/11681:
2 locks held by syz-executor.2/14782:
3 locks held by kworker/0:0/16005:
 #0: 00000000640871bb ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
 #1: 00000000888c8470 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
 #2: 000000001744bc88 (rtnl_mutex){+.+.}, at: addrconf_dad_work+0x9c/0x10a0 net/ipv6/addrconf.c:3989
2 locks held by syz-executor.5/16102:
1 lock held by syz-executor.1/16123:
 #0: 000000001744bc88 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline]
 #0: 000000001744bc88 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4779
1 lock held by syz-executor.3/16125:
 #0: 000000001744bc88 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline]
 #0: 000000001744bc88 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4779
1 lock held by syz-executor.5/16140:
1 lock held by systemd-udevd/16144:
1 lock held by syz-executor.1/16146:
 #0: 000000001744bc88 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline]
 #0: 000000001744bc88 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4779
1 lock held by kworker/u4:6/16153:

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

NMI backtrace for cpu 1
CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
 watchdog+0x991/0xe60 kernel/hung_task.c:287
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 10750 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:native_apic_mem_write+0x8/0x10 arch/x86/include/asm/apic.h:109
Code: 3d cc 17 3d 0b 01 7f 02 5d c3 89 ef 5d e9 f5 fe c9 06 48 c7 c7 00 97 65 8c e8 84 e2 6f 00 eb df 66 90 89 ff 89 b7 00 c0 5f ff <c3> 0f 1f 80 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 53 89 fb 48
RSP: 0018:ffff8880ba007978 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffffff89cfb1a0 RCX: 0000000000000020
RDX: 1ffffffff139f636 RSI: 00000000000000e9 RDI: 0000000000000380
RBP: ffff8880ba01e2c0 R08: ffffffff8c665018 R09: 0000000000000000
R10: 0000000000000007 R11: ffffffff8c66501b R12: 00000000000000e9
R13: 0000000000000000 R14: ffff8880ba024cc0 R15: ffff8880ba024d30
FS:  00007f3b1cb0b700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c000553fd8 CR3: 00000000394d5000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 apic_write arch/x86/include/asm/apic.h:389 [inline]
 lapic_next_event+0x4d/0x80 arch/x86/kernel/apic/apic.c:460
 clockevents_program_event+0x234/0x350 kernel/time/clockevents.c:344
 tick_program_event+0xac/0x140 kernel/time/tick-oneshot.c:48
 hrtimer_interrupt+0x40a/0x9e0 kernel/time/hrtimer.c:1598
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:kfree+0x123/0x210 mm/slab.c:3823
Code: 89 ea 48 89 ee 4c 89 e7 e8 da ee ff ff f6 c7 02 74 ca e8 20 74 cf ff 48 83 3d 60 4d 59 08 00 0f 84 eb 00 00 00 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d 41 5c 41 5d c3 65 8b 05 ea 4b 69 7e 83 f8 07
RSP: 0018:ffff8880ba007b90 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: 0000000000000286 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8880a1686a08 RDI: 0000000000000286
RBP: ffff888053561840 R08: 0000000000400000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88813bff0940
R13: ffffffff8670bf6e R14: 0000000000000000 R15: ffff888053561930
 skb_free_head net/core/skbuff.c:563 [inline]
 skb_release_data+0x6de/0x920 net/core/skbuff.c:583
 skb_release_all net/core/skbuff.c:640 [inline]
 __kfree_skb net/core/skbuff.c:654 [inline]
 consume_skb+0x113/0x3d0 net/core/skbuff.c:714
 can_receive+0x358/0x530 net/can/af_can.c:712
 canfd_rcv+0x12f/0x1d0 net/can/af_can.c:764
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:4954
 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066
 process_backlog+0x241/0x700 net/core/dev.c:5849
 napi_poll net/core/dev.c:6280 [inline]
 net_rx_action+0x4ac/0xfb0 net/core/dev.c:6346
 __do_softirq+0x265/0x980 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x215/0x260 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:free_unref_page+0x113/0x170 mm/page_alloc.c:2817
Code: 48 c7 c0 88 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 54 48 83 3d 6c 98 72 08 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d 41 5c c3 0f 0b 0f 0b 0f 0b 0f 0b 48 c7 c7 80
RSP: 0018:ffff8880562579a0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13e3051 RBX: 0000000000000286 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286
RBP: 000000000009bdff R08: ffffed10137bfe00 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00026f7fc0
R13: ffffed10152c59f4 R14: ffffed10152c59f5 R15: ffffea00026f7fc0
 __vunmap+0x21b/0x3f0 mm/vmalloc.c:1531
 vfree+0x65/0x100 mm/vmalloc.c:1598
 kcov_put kernel/kcov.c:237 [inline]
 kcov_put+0x1f/0x30 kernel/kcov.c:234
 kcov_close+0xc/0x10 kernel/kcov.c:323
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xbf3/0x2be0 kernel/exit.c:870
 do_group_exit+0x125/0x310 kernel/exit.c:967
 get_signal+0x3f2/0x1f70 kernel/signal.c:2589
 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799
 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f3b1e5bddf1
Code: Bad RIP value.
RSP: 002b:00007f3b1cb0b0b0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f3b1e6b8f80 RCX: 00007f3b1e5bddf1
RDX: 00007f3b1cb0b0f0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f3b1e5f4ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fff4093d24f R14: 00007f3b1cb0b300 R15: 0000000000022000

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/21 03:03 linux-4.19.y 3f8a27f9e27b cc0f9968 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 INFO: task hung in cfg80211_event_work
* Struck through repros no longer work on HEAD.