syzbot


INFO: task hung in ip6mr_sk_done (3)

Status: auto-closed as invalid on 2022/01/19 01:57
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 440d, last: 401d
similar bugs (6):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in ip6mr_sk_done (2) 1 783d 783d 0/24 auto-closed as invalid on 2021/01/01 18:48
android-49 INFO: task hung in ip6mr_sk_done 1 1674d 1674d 0/3 auto-closed as invalid on 2019/02/22 12:59
android-44 INFO: task hung in ip6mr_sk_done 1 1686d 1686d 0/2 auto-closed as invalid on 2019/02/22 13:39
linux-4.14 INFO: task hung in ip6mr_sk_done 1 985d 985d 0/1 auto-closed as invalid on 2020/07/14 17:23
upstream INFO: task hung in ip6mr_sk_done 1 885d 885d 0/24 auto-closed as invalid on 2020/09/23 10:25
linux-4.19 INFO: task hung in ip6mr_sk_done 1 317d 317d 0/1 auto-closed as invalid on 2022/05/13 06:41

Sample crash report:
INFO: task syz-executor.1:12595 blocked for more than 143 seconds.
      Not tainted 5.15.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:28152 pid:12595 ppid:  6610 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:4940 [inline]
 __schedule+0x940/0x26f0 kernel/sched/core.c:6287
 schedule+0xd3/0x270 kernel/sched/core.c:6366
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425
 __mutex_lock_common kernel/locking/mutex.c:669 [inline]
 __mutex_lock+0xa34/0x12f0 kernel/locking/mutex.c:729
 ip6mr_sk_done+0xe9/0x370 net/ipv6/ip6mr.c:1582
 rawv6_close+0x58/0x80 net/ipv6/raw.c:1198
 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431
 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:479
 __sock_release+0xcd/0x280 net/socket.c:649
 sock_close+0x18/0x20 net/socket.c:1314
 __fput+0x288/0x9f0 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xbae/0x2a30 kernel/exit.c:825
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x47f/0x2160 kernel/signal.c:2868
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:313
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0033:0x7f4b577a679c
RSP: 002b:00007f4b57e30900 EFLAGS: 00000206
RAX: 00007f4b5765e790 RBX: 00007f4b5765e610 RCX: ffffffff8466c43e
RDX: ffffffff84668b01 RSI: 00007f4b5765e618 RDI: ffffffff846719fa
RBP: 00007f4b5765e570 R08: 00007f4b5765e7f8 R09: 0000001b2eb288d4
R10: 0000000000001c6f R11: 00000000e7cf3c73 R12: 00007f4b5765e568
R13: 00007f4b5765e610 R14: 00007f4b5765e560 R15: 0000000000000016

Showing all locks held in the system:
1 lock held by khungtaskd/26:
 #0: ffffffff8b97fe60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446
2 locks held by kworker/1:1/31:
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline]
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x8a3/0x16b0 kernel/workqueue.c:2268
 #1: ffffc90000e6fdb0 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x8d7/0x16b0 kernel/workqueue.c:2272
1 lock held by in:imklog/6245:
 #0: ffff888073463770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
3 locks held by kworker/1:4/8020:
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x8a3/0x16b0 kernel/workqueue.c:2268
 #1: ffffc9000b3dfdb0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x8d7/0x16b0 kernel/workqueue.c:2272
 #2: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:251
3 locks held by kworker/0:4/8413:
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x8a3/0x16b0 kernel/workqueue.c:2268
 #1: ffffc90016e47db0 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x8d7/0x16b0 kernel/workqueue.c:2272
 #2: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74
3 locks held by kworker/1:7/8541:
 #0: ffff888147846138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888147846138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888147846138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
 #0: ffff888147846138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline]
 #0: ffff888147846138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
 #0: ffff888147846138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x8a3/0x16b0 kernel/workqueue.c:2268
 #1: ffffc90017327db0 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8d7/0x16b0 kernel/workqueue.c:2272
 #2: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4590
1 lock held by syz-executor.1/9883:
 #0: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:684 [inline]
 #0: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3397
5 locks held by syz-executor.2/12597:
2 locks held by syz-executor.0/12594:
 #0: ffff888075d22010 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:786 [inline]
 #0: ffff888075d22010 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:648
 #1: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: ip6mr_sk_done+0xe9/0x370 net/ipv6/ip6mr.c:1582
1 lock held by syz-executor.0/12600:
 #0: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x6fa/0xa80 net/core/dev.c:10598
2 locks held by syz-executor.1/12595:
 #0: ffff88807bff2010 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:786 [inline]
 #0: ffff88807bff2010 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:648
 #1: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: ip6mr_sk_done+0xe9/0x370 net/ipv6/ip6mr.c:1582
2 locks held by syz-executor.3/12601:
 #0: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:684 [inline]
 #0: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3397
 #1: ffffffff8b9891e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #1: ffffffff8b9891e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4fc/0x620 kernel/rcu/tree_exp.h:837
1 lock held by syz-executor.4/12605:
 #0: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x6fa/0xa80 net/core/dev.c:10598
1 lock held by syz-executor.5/12629:
 #0: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:684 [inline]
 #0: ffffffff8d0e40a8 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3397

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

NMI backtrace for cpu 1
CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
 watchdog+0xc1d/0xf50 kernel/hung_task.c:295
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 13 Comm: ksoftirqd/0 Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_kcov_mode+0x9/0x40 kernel/kcov.c:163
Code: 59 fe ff ff 48 8b 7c 24 08 e8 b3 57 47 00 e9 61 fd ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc 65 8b 05 d9 fc 8b 7e 89 c2 <81> e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 3c
RSP: 0018:ffffc90000d27b28 EFLAGS: 00000246
RAX: 0000000080000101 RBX: ffff888036171170 RCX: fffffff0a3da8872
RDX: 0000000080000101 RSI: ffff888011f08000 RDI: 0000000000000003
RBP: fffffff0a3da8872 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff875179c6 R11: 0000000000000000 R12: fffffff0a3da8872
R13: ffff88806fbdc300 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a7d7e3a458 CR3: 000000002a91f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 write_comp_data kernel/kcov.c:218 [inline]
 __sanitizer_cov_trace_cmp8+0x1d/0x70 kernel/kcov.c:264
 pie_calculate_probability+0x336/0x7c0 net/sched/sch_pie.c:390
 fq_pie_timer+0x170/0x2a0 net/sched/sch_fq_pie.c:383
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 run_ksoftirqd kernel/softirq.c:920 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	48 8b 7c 24 08       	mov    0x8(%rsp),%rdi
   5:	e8 b3 57 47 00       	callq  0x4757bd
   a:	e9 61 fd ff ff       	jmpq   0xfffffd70
   f:	cc                   	int3
  10:	cc                   	int3
  11:	cc                   	int3
  12:	cc                   	int3
  13:	cc                   	int3
  14:	cc                   	int3
  15:	cc                   	int3
  16:	cc                   	int3
  17:	cc                   	int3
  18:	cc                   	int3
  19:	cc                   	int3
  1a:	cc                   	int3
  1b:	cc                   	int3
  1c:	cc                   	int3
  1d:	65 8b 05 d9 fc 8b 7e 	mov    %gs:0x7e8bfcd9(%rip),%eax        # 0x7e8bfcfd
  24:	89 c2                	mov    %eax,%edx
* 26:	81 e2 00 01 00 00    	and    $0x100,%edx <-- trapping instruction
  2c:	a9 00 01 ff 00       	test   $0xff0100,%eax
  31:	74 10                	je     0x43
  33:	31 c0                	xor    %eax,%eax
  35:	85 d2                	test   %edx,%edx
  37:	74 15                	je     0x4e
  39:	8b                   	.byte 0x8b
  3a:	96                   	xchg   %eax,%esi
  3b:	3c                   	.byte 0x3c

Crashes (15):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce 2021/09/29 05:07 upstream a4e6f95a891a d82cb927 .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-kasan-gce-selinux-root 2021/09/20 18:56 upstream e4e737bb5c17 af796c18 .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-kasan-gce 2021/09/17 20:14 upstream ddf21bd8ab98 70b76c1d .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-kasan-gce-selinux-root 2021/09/15 06:36 upstream 1619b69edce1 07e953c1 .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-kasan-gce-smack-root 2021/09/15 05:59 upstream 1619b69edce1 07e953c1 .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-kasan-gce-smack-root 2021/09/12 17:30 upstream 78e709522d2c 5ae8508a .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-net-kasan-gce 2021/10/19 23:36 net-next cb3dc8901ba4 466b7db1 .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-net-kasan-gce 2021/10/19 21:20 net-next cb3dc8901ba4 466b7db1 .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-net-kasan-gce 2021/10/19 13:26 net-next cb3dc8901ba4 24dc29db .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-net-kasan-gce 2021/10/18 15:51 net-next d40dfa0cebd8 0c5d9412 .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-net-kasan-gce 2021/10/18 14:44 net-next d40dfa0cebd8 0c5d9412 .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-linux-next-kasan-gce-root 2021/10/21 00:01 linux-next 51dba6e335ff f111d03b .config log report info INFO: task hung in ip6mr_sk_done
ci-upstream-linux-next-kasan-gce-root 2021/10/21 01:49 linux-next 51dba6e335ff f111d03b .config log report info INFO: task can't die in ip6mr_sk_done
ci-upstream-linux-next-kasan-gce-root 2021/10/20 11:59 linux-next 51dba6e335ff 418a00eb .config log report info INFO: task can't die in ip6mr_sk_done
ci-upstream-linux-next-kasan-gce-root 2021/09/16 06:02 linux-next 70ced02f322f 07e953c1 .config log report info INFO: task can't die in ip6mr_sk_done
* Struck through repros no longer work on HEAD.