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INFO: task hung in get_info

Status: auto-closed as invalid on 2019/02/22 10:34
Subsystems: netfilter
[Documentation on labels]
Reported-by: syzbot+41acdbdb481f47bd942a@syzkaller.appspotmail.com
First crash: 2248d, last: 2242d
▶ ▼ Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 INFO: task hung in get_info 2 1537d 1540d 0/1 auto-closed as invalid on 2020/06/06 08:06
android-49 INFO: task hung in get_info 1 2051d 2051d 0/3 auto-closed as invalid on 2019/03/10 04:11
linux-4.19 INFO: task hung in get_info C error 13 1126d 1188d 0/1 upstream: reported C repro on 2021/01/21 06:12
android-414 INFO: task hung in get_info 14 1631d 1836d 0/1 auto-closed as invalid on 2020/03/04 07:49
upstream INFO: task hung in get_info (3) netfilter 5 1151d 1197d 0/26 auto-closed as invalid on 2021/05/27 19:05
upstream INFO: task hung in get_info (4) netfilter 4 830d 855d 0/26 closed as invalid on 2022/02/08 09:50
upstream INFO: task hung in get_info (2) netfilter 2 1710d 1714d 0/26 auto-closed as invalid on 2019/11/15 17:14
android-44 INFO: task hung in get_info 3 1655d 1805d 0/2 auto-closed as invalid on 2020/02/09 04:02
android-49 INFO: task hung in get_info (2) 1 1731d 1730d 0/3 auto-closed as invalid on 2019/11/25 07:20

Sample crash report:
Buffer I/O error on dev loop0, logical block 0, async page read
INFO: task syz-executor7:4237 blocked for more than 120 seconds.
      Not tainted 4.16.0-rc3+ #330
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D22160  4237      1 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2862 [inline]
 __schedule+0x905/0x2070 kernel/sched/core.c:3440
 schedule+0xf5/0x430 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1040
 xt_request_find_table_lock+0x28/0xc0 net/netfilter/x_tables.c:1087
 get_info+0x154/0x690 net/ipv6/netfilter/ip6_tables.c:993
 do_ip6t_get_ctl+0x159/0xaf0 net/ipv6/netfilter/ip6_tables.c:1714
 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
 nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122
 ipv6_getsockopt+0x1d5/0x2c0 net/ipv6/ipv6_sockglue.c:1370
 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3359
 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2934
 SYSC_getsockopt net/socket.c:1880 [inline]
 SyS_getsockopt+0x178/0x340 net/socket.c:1862
 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45683a
RSP: 002b:0000000000a3e3b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000a3e3e0 RCX: 000000000045683a
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000013
RBP: 00000000006fd720 R08: 0000000000a3e3dc R09: 0000000000004000
R10: 0000000000a3e3e0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000013 R14: 0000000000000029 R15: 00000000006fb560

Showing all locks held in the system:
2 locks held by khungtaskd/794:
 #0:  (rcu_read_lock){....}, at: [<00000000f2e23315>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
 #0:  (rcu_read_lock){....}, at: [<00000000f2e23315>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249
 #1:  (tasklist_lock){.+.+}, at: [<00000000e9297713>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
1 lock held by rsyslogd/4040:
 #0:  (&f->f_pos_lock){+.+.}, at: [<0000000082cca4c6>] __fdget_pos+0x12b/0x190 fs/file.c:765
2 locks held by getty/4162:
 #0:  (&tty->ldisc_sem){++++}, at: [<000000005f2fb7f7>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<0000000004c165f9>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4163:
 #0:  (&tty->ldisc_sem){++++}, at: [<000000005f2fb7f7>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<0000000004c165f9>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4164:
 #0:  (&tty->ldisc_sem){++++}, at: [<000000005f2fb7f7>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<0000000004c165f9>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4165:
 #0:  (&tty->ldisc_sem){++++}, at: [<000000005f2fb7f7>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<0000000004c165f9>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4166:
 #0:  (&tty->ldisc_sem){++++}, at: [<000000005f2fb7f7>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<0000000004c165f9>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4167:
 #0:  (&tty->ldisc_sem){++++}, at: [<000000005f2fb7f7>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<0000000004c165f9>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
1 lock held by syz-executor7/4237:
 #0:  (&xt[i].mutex){+.+.}, at: [<0000000005236191>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1040
1 lock held by syz-executor4/4242:
 #0:  (&xt[i].mutex){+.+.}, at: [<0000000005236191>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1040
1 lock held by syz-executor6/4244:
 #0:  (&xt[i].mutex){+.+.}, at: [<0000000005236191>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1040
1 lock held by syz-executor5/4245:
 #0:  (&xt[i].mutex){+.+.}, at: [<0000000005236191>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1040
1 lock held by syz-executor1/4247:
 #0:  (&xt[i].mutex){+.+.}, at: [<0000000005236191>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1040
1 lock held by syz-executor2/23072:
 #0:  (&xt[i].mutex){+.+.}, at: [<0000000005236191>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1040
2 locks held by getty/32490:
 #0:  (&tty->ldisc_sem){++++}, at: [<000000005f2fb7f7>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<0000000004c165f9>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
1 lock held by syz-executor3/10669:
 #0:  (&xt[i].mutex){+.+.}, at: [<00000000f378abbd>] xt_find_target+0x44/0x1e0 net/netfilter/x_tables.c:231
1 lock held by syz-executor3/10671:
 #0:  (&xt[i].mutex){+.+.}, at: [<00000000f378abbd>] xt_find_target+0x44/0x1e0 net/netfilter/x_tables.c:231

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

NMI backtrace for cpu 0
CPU: 0 PID: 794 Comm: khungtaskd Not tainted 4.16.0-rc3+ #330
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
 check_hung_task kernel/hung_task.c:132 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
 watchdog+0x90c/0xd60 kernel/hung_task.c:249
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:407
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6909 Comm: syz-executor0 Not tainted 4.16.0-rc3+ #330
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:match_held_lock+0xcb/0x880 kernel/locking/lockdep.c:3495
RSP: 0018:ffff8801af8ef4f8 EFLAGS: 00000046
RAX: 0000000000000003 RBX: 1ffff10035f1dea4 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff86f42800 RDI: ffff8801d4ff2c9a
RBP: ffff8801af8ef5e8 R08: 1ffff10035f1dea7 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d4ff2400
R13: ffff8801d4ff2c78 R14: 0000000000000000 R15: ffff8801af8ef5c0
FS:  000000000138c940(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbde502e000 CR3: 00000001cdb7c003 CR4: 00000000001626e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __lock_is_held+0xb6/0x140 kernel/locking/lockdep.c:3740
 lock_is_held_type+0x118/0x210 kernel/locking/lockdep.c:3958
 lock_is_held include/linux/lockdep.h:344 [inline]
 rcu_preempt_sleep_check include/linux/rcupdate.h:301 [inline]
 ___might_sleep+0x35e/0x470 kernel/sched/core.c:6098
 htable_selective_cleanup+0x29c/0x3d0 net/netfilter/xt_hashlimit.c:381
 htable_destroy net/netfilter/xt_hashlimit.c:415 [inline]
 htable_put+0x1de/0x300 net/netfilter/xt_hashlimit.c:442
 hashlimit_mt_destroy+0x56/0x70 net/netfilter/xt_hashlimit.c:979
 cleanup_match+0x14e/0x220 net/ipv6/netfilter/ip6_tables.c:485
 cleanup_entry+0xef/0x380 net/ipv6/netfilter/ip6_tables.c:669
 __do_replace+0x7ac/0xa70 net/ipv6/netfilter/ip6_tables.c:1112
 do_replace net/ipv6/netfilter/ip6_tables.c:1168 [inline]
 do_ip6t_set_ctl+0x40f/0x5f0 net/ipv6/netfilter/ip6_tables.c:1690
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
 ipv6_setsockopt+0x10b/0x130 net/ipv6/ipv6_sockglue.c:927
 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905
 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975
 SYSC_setsockopt net/socket.c:1849 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1828
 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45685a
RSP: 002b:0000000000a3e3b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000a3e3e0 RCX: 000000000045685a
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000013
RBP: 00000000006fd720 R08: 00000000000002e8 R09: 0000000000004000
R10: 00000000006fc940 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000013 R14: 0000000000000029 R15: 00000000006fc9a0
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 9d 04 00 00 66 41 f7 45 22 f0 ff <0f> 84 f9 01 00 00 48 8d 7e 08 48 b8 00 00 00 00 00 fc ff df 48

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/02/26 20:12 upstream 4a3928c6f8a5 b370d4a7 .config console log report ci-upstream-kasan-gce
2018/03/03 09:34 net-next-old 3c34cb9defb0 2c6f473e .config console log report ci-upstream-net-kasan-gce
2018/03/03 06:05 net-next-old 3c34cb9defb0 2c6f473e .config console log report ci-upstream-net-kasan-gce
2018/03/01 16:13 net-next-old a25724b05af0 c4089507 .config console log report ci-upstream-net-kasan-gce
2018/02/28 07:23 net-next-old 3f5a68300a40 05b5a32c .config console log report ci-upstream-net-kasan-gce
2018/02/26 07:46 net-next-old f74290fdb363 9fe8aa42 .config console log report ci-upstream-net-kasan-gce
2018/02/25 22:51 net-next-old f74290fdb363 9fe8aa42 .config console log report ci-upstream-net-kasan-gce
2018/02/25 13:01 net-next-old f74290fdb363 5c1e0207 .config console log report ci-upstream-net-kasan-gce
* Struck through repros no longer work on HEAD.