syzbot


INFO: task hung in addrconf_dad_work

Status: auto-closed as invalid on 2019/10/25 08:37
Reported-by: syzbot+c6ed648d5b2a167f7864@syzkaller.appspotmail.com
First crash: 1838d, last: 1838d
Similar bugs (11)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in addrconf_dad_work (2) 58 12m 118d 0/3 upstream: reported on 2024/02/24 10:20
android-49 INFO: task hung in addrconf_dad_work 1 2125d 2125d 0/3 auto-closed as invalid on 2019/02/22 20:09
upstream INFO: task hung in addrconf_dad_work (2) net C unreliable error 107 211d 566d 0/27 closed as invalid on 2023/11/23 17:05
linux-6.1 INFO: task hung in addrconf_dad_work 2 400d 430d 0/3 auto-obsoleted due to no activity on 2023/08/26 05:16
upstream INFO: task hung in addrconf_dad_work net C inconclusive inconclusive 468 911d 1952d 0/27 closed as invalid on 2022/02/08 10:54
linux-5.15 INFO: task hung in addrconf_dad_work 107 23h01m 153d 0/3 upstream: reported on 2024/01/20 08:09
upstream INFO: task hung in addrconf_dad_work (3) net C 185 101d 142d 26/27 fixed on 2024/03/25 23:45
linux-4.19 INFO: task hung in addrconf_dad_work 1 1760d 1760d 0/1 auto-closed as invalid on 2019/12/24 18:36
linux-4.19 INFO: task hung in addrconf_dad_work (2) C error 72 479d 1551d 0/1 upstream: reported C repro on 2020/03/22 17:39
linux-4.14 INFO: task hung in addrconf_dad_work C inconclusive 1 726d 1332d 0/1 upstream: reported C repro on 2020/10/27 17:48
upstream INFO: task hung in addrconf_dad_work (4) net 2578 12h02m 32d 21/27 upstream: reported on 2024/05/20 03:26

Sample crash report:
[17100]     0 17100     6022      836      16       3        0         -1000 udevd
[17101]     0 17101     6022      836      16       3        0         -1000 udevd
[17102]     0 17102     6022      836      16       3        0         -1000 udevd
[17103]     0 17103     6022      836      16       3        0         -1000 udevd
[17104]     0 17104     6022      836      16       3        0         -1000 udevd
INFO: task kworker/0:2:19748 blocked for more than 140 seconds.
      Not tainted 4.14.124+ #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:2     D29416 19748      2 0x80000000
[17105]     0 17105     6023      825      16       3        0         -1000 udevd
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
[17106]     0 17106     6022      836      16       3        0         -1000 udevd
[17107]     0 17107    11804     9777      30       3        0         -1000 blkid
[17108]     0 17108    11278     9241      29       3        0         -1000 blkid
[17109]     0 17109    11400     9381      29       3        0         -1000 blkid
 schedule+0x92/0x1c0 kernel/sched/core.c:3498
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
[17110]     0 17110    11110     9044      28       3        0         -1000 blkid
[17111]     0 17111    11730     9704      29       3        0         -1000 blkid
[17112]     0 17112    10718     8649      28       3        0         -1000 blkid
[17113]     0 17113    11120     9046      27       3        0         -1000 blkid
 addrconf_dad_work+0xa6/0x1170 net/ipv6/addrconf.c:3936
[17114]     0 17114    10052     7991      26       3        0         -1000 blkid
[17116]     0 17116    11446     9379      30       3        0         -1000 blkid
 process_one_work+0x7c6/0x1510 kernel/workqueue.c:2134
 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2271
 kthread+0x310/0x420 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404
INFO: task syz-executor.2:17183 blocked for more than 140 seconds.
      Not tainted 4.14.124+ #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D27872 17183   2855 0x00000004
Call Trace:
[17117]     0 17117     6022      837      16       3        0         -1000 udevd
[17118]     0 17118     6022      837      16       3        0         -1000 udevd
[17119]     0 17119     6022      837      16       3        0         -1000 udevd
[17120]     0 17120     6022      837      16       3        0         -1000 udevd
[17121]     0 17121    10686     8650      28       3        0         -1000 blkid
[17122]     0 17122     6022      837      16       3        0         -1000 udevd
[17123]     0 17123     6022      837      16       3        0         -1000 udevd
[17124]     0 17124     6022      837      16       3        0         -1000 udevd
[17125]     0 17125     6022      857      16       3        0         -1000 udevd
[17126]     0 17126     6022      837      16       3        0         -1000 udevd
 schedule+0x92/0x1c0 kernel/sched/core.c:3498
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
[17127]     0 17127    10144     8121      27       3        0         -1000 blkid
[17128]     0 17128    10758     8715      28       3        0         -1000 blkid
[17129]     0 17129    11636     9577      30       3        0         -1000 blkid
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
[17130]     0 17130    11048     8980      30       3        0         -1000 blkid
[17131]     0 17131    11254     9176      28       3        0         -1000 blkid
[17132]     0 17132     6022      837      16       3        0         -1000 udevd
[17133]     0 17133    10714     8648      27       3        0         -1000 blkid
[17134]     0 17134     6022      837      16       3        0         -1000 udevd
 dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421
[17135]     0 17135     6022      837      16       3        0         -1000 udevd
[17136]     0 17136     6022      838      16       3        0         -1000 udevd
[17137]     0 17137    11668     9640      30       3        0         -1000 blkid
[17138]     0 17138    11272     9244      29       4        0         -1000 blkid
[17139]     0 17139    11024     8978      28       3        0         -1000 blkid
[17140]     0 17140    11362     9314      29       3        0         -1000 blkid
[17141]     0 17141    10778     8714      28       3        0         -1000 blkid
[17142]     0 17142    11962     9908      30       3        0         -1000 blkid
[17143]     0 17143     6022      838      16       3        0         -1000 udevd
[17144]     0 17144     6022      838      16       3        0         -1000 udevd
 sock_do_ioctl+0x92/0xb0 net/socket.c:981
 sock_ioctl+0x253/0x440 net/socket.c:1071
[17145]     0 17145    12604    10568      31       3        0         -1000 blkid
[17146]     0 17146     6022      858      16       3        0         -1000 udevd
[17147]     0 17147     6023      826      16       3        0         -1000 udevd
[17148]     0 17148     6022      838      16       3        0         -1000 udevd
[17149]     0 17149     6022      838      16       3        0         -1000 udevd
[17150]     0 17150     6022      838      16       3        0         -1000 udevd
[17151]     0 17151     6022      838      16       3        0         -1000 udevd
[17152]     0 17152    11080     9043      29       3        0         -1000 blkid
[17153]     0 17153    11160     9111      29       3        0         -1000 blkid
[17154]     0 17154    10938     8918      28       3        0         -1000 blkid
[17155]     0 17155    11298     9244      29       3        0         -1000 blkid
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
[17156]     0 17156    11484     9445      28       3        0         -1000 blkid
[17157]     0 17157     6022      838      16       3        0         -1000 udevd
[17158]     0 17158     6022      858      16       3        0         -1000 udevd
[17159]     0 17159     6022      838      16       3        0         -1000 udevd
[17160]     0 17160     6022      839      16       3        0         -1000 udevd
[17161]     0 17161    10860     8782      29       3        0         -1000 blkid
[17162]     0 17162     6022      839      16       3        0         -1000 udevd
[17163]     0 17163    10424     8383      27       3        0         -1000 blkid
[17164]     0 17164    10082     8063      25       3        0         -1000 blkid
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x19b/0x510 arch/x86/entry/common.c:292
[17165]     0 17165     9570     7529      26       3        0         -1000 blkid
[17166]     0 17166    11002     8978      29       3        0         -1000 blkid
[17167]     0 17167    11214     9179      28       3        0         -1000 blkid
[17168]     0 17168     6022      839      16       3        0         -1000 udevd
[17169]     0 17169     6022      859      16       3        0         -1000 udevd

Showing all locks held in the system:
[17170]     0 17170     6022      859      16       3        0         -1000 udevd
1 lock held by init/1:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by khungtaskd/23:
 #0:  (tasklist_lock){.+.+}, at: [<00000000b9210739>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541
[17171]     0 17171     6022      839      16       3        0         -1000 udevd
3 locks held by udevd/191:
 #0:  (&dup_mmap_sem){.+.+}, at: [<000000001161c81c>] dup_mmap kernel/fork.c:609 [inline]
 #0:  (&dup_mmap_sem){.+.+}, at: [<000000001161c81c>] dup_mm kernel/fork.c:1211 [inline]
 #0:  (&dup_mmap_sem){.+.+}, at: [<000000001161c81c>] copy_mm kernel/fork.c:1266 [inline]
 #0:  (&dup_mmap_sem){.+.+}, at: [<000000001161c81c>] copy_process.part.0+0x39db/0x65d0 kernel/fork.c:1789
 #1:  (&mm->mmap_sem){++++}, at: [<000000003af2c211>] dup_mmap kernel/fork.c:610 [inline]
 #1:  (&mm->mmap_sem){++++}, at: [<000000003af2c211>] dup_mm kernel/fork.c:1211 [inline]
 #1:  (&mm->mmap_sem){++++}, at: [<000000003af2c211>] copy_mm kernel/fork.c:1266 [inline]
 #1:  (&mm->mmap_sem){++++}, at: [<000000003af2c211>] copy_process.part.0+0x39f7/0x65d0 kernel/fork.c:1789
 #2:  (&mm->mmap_sem/1){+.+.}, at: [<0000000027d80e62>] dup_mmap kernel/fork.c:619 [inline]
 #2:  (&mm->mmap_sem/1){+.+.}, at: [<0000000027d80e62>] dup_mm kernel/fork.c:1211 [inline]
 #2:  (&mm->mmap_sem/1){+.+.}, at: [<0000000027d80e62>] copy_mm kernel/fork.c:1266 [inline]
 #2:  (&mm->mmap_sem/1){+.+.}, at: [<0000000027d80e62>] copy_process.part.0+0x3a3f/0x65d0 kernel/fork.c:1789
[17172]     0 17172     6022      859      16       3        0         -1000 udevd
1 lock held by rsyslogd/1632:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
[17173]     0 17173     6022      839      16       3        0         -1000 udevd
[17174]     0 17174    10126     8059      26       3        0         -1000 blkid
[17183]     0 17175    18211     8957      26       4        0          1000 syz-executor.2
[17179]     0 17179     9892     7862      26       3        0         -1000 blkid
[17181]     0 17181     6022      839      16       3        0         -1000 udevd
[17184]     0 17184     6022      839      16       3        0         -1000 udevd
[17185]     0 17185     6022      839      16       3        0         -1000 udevd
[17187]     0 17187     9672     7597      26       3        0         -1000 blkid
[17188]     0 17188     9322     7267      25       3        0         -1000 blkid
[17189]     0 17189     9696     7661      26       3        0         -1000 blkid
[17192]     0 17192     9572     7533      26       3        0         -1000 blkid
[17195]     0 17195     9086     7009      25       3        0         -1000 blkid
[17196]     0 17196     6022      840      16       3        0         -1000 udevd
[17197]     0 17197     9502     7464      26       3        0         -1000 blkid
[17198]     0 17198    10034     7991      26       3        0         -1000 blkid
[17199]     0 17199     8964     6936      25       3        0         -1000 blkid
[17200]     0 17200     6022      860      16       3        0         -1000 udevd
[17201]     0 17201     6023      828      16       3        0         -1000 udevd
[17202]     0 17202     6022      840      16       3        0         -1000 udevd
[17203]     0 17203     6022      840      16       3        0         -1000 udevd
[17204]     0 17204     6022      840      16       3        0         -1000 udevd
[17205]     0 17205     9284     7202      25       3        0         -1000 blkid
[17206]     0 17206     9184     7134      24       3        0         -1000 blkid
[17207]     0 17207     8924     6870      23       3        0         -1000 blkid
[17208]     0 17208     6023      828      16       3        0         -1000 udevd
[17209]     0 17209     6022      840      16       3        0         -1000 udevd
1 lock held by rsyslogd/1633:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
2 locks held by getty/1761:
 #0:  (&tty->ldisc_sem){++++}, at: [<0000000060b5c123>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000b42905b4>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
1 lock held by syz-fuzzer/1792:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by syz-fuzzer/1793:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
3 locks held by kworker/0:2/19748:
 #0:  ("%s"("ipv6_addrconf")
[17210]     0 17210     6022      840      16       3        0         -1000 udevd
){+.+.}
[17211]     0 17211     8844     6806      25       3        0         -1000 blkid
, at: [<000000008f95bea0>] process_one_work+0x6e5/0x1510 kernel/workqueue.c:2105
[17212]     0 17212     8706     6671      24       3        0         -1000 blkid
 #1:  ((&(&ifa->dad_work)->work)){+.+.}, at: [<0000000020860813>] process_one_work+0x71b/0x1510 kernel/workqueue.c:2109
 #2: 
[17213]     0 17213     7998     5948      22       3        0         -1000 blkid
 (
[17215]     0 17215     8536     6473      24       3        0         -1000 blkid
rtnl_mutex){+.+.}
[17218]     0 17217    18244     8979      25       4        0             0 syz-executor.1
, at: [<00000000b47b599f>] addrconf_dad_work+0xa6/0x1170 net/ipv6/addrconf.c:3936
4 locks held by kworker/u4:23/20436:
[17219]     0 17219     6022      840      16       3        0         -1000 udevd
 #0:  ("%s""netns"){+.+.}, at: [<000000008f95bea0>] process_one_work+0x6e5/0x1510 kernel/workqueue.c:2105
 #1:  (net_cleanup_work){+.+.}, at: [<0000000020860813>] process_one_work+0x71b/0x1510 kernel/workqueue.c:2109
 #2:  (net_mutex){+.+.}, at: [<0000000043cd6e66>] cleanup_net+0x136/0x860 net/core/net_namespace.c:450
 #3:  (rtnl_mutex){+.+.}, at: [<00000000e2d3b8ba>] raw_close+0xe/0x30 net/ipv4/raw.c:699
1 lock held by syz-executor.3/16858:
 #0:  (rtnl_mutex){+.+.}, at: [<0000000087d521ef>] netdev_run_todo+0x1f9/0x740 net/core/dev.c:7906
2 locks held by syz-executor.3/16861:
 #0:  (rtnl_mutex){+.+.}, at: [<00000000dc87ed98>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<00000000dc87ed98>] rtnetlink_rcv_msg+0x330/0xb40 net/core/rtnetlink.c:4280
 #1:  (kernfs_mutex){+.+.}, at: [<00000000111cbc6a>] kernfs_remove+0x17/0x30 fs/kernfs/dir.c:1328
1 lock held by udevd/16950:
[17220]     0 17220     8550     6476      23       3        0         -1000 blkid
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by udevd/17000:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by blkid/17003:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by udevd/17004:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by udevd/17005:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by udevd/17006:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
[17221]     0 17221     8874     6807      24       3        0         -1000 blkid
1 lock held by blkid/17007:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17008:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17009:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17011:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17012:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17013:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by udevd/17014:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by udevd/17016:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by udevd/17017:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by udevd/17018:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by blkid/17019:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17021:
 #0:  (&mm->mmap_sem
[17222]     0 17222     6022      840      16       3        0         -1000 udevd
){++++}
[17223]     0 17223     6022      840      16       3        0         -1000 udevd
, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
[17226]     0 17226     8678     6606      23       3        0         -1000 blkid
1 lock held by blkid/17022:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17023:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17024:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by udevd/17025:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by udevd/17026:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by udevd/17027:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by blkid/17028:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by udevd/17029:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by udevd/17030:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by blkid/17031:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by udevd/17032:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by blkid/17033:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17034:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17035:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17036:
 #0:  (
[17229]     0 17229     6022      841      16       3        0         -1000 udevd
&mm->mmap_sem
[17230]     0 17230     8426     6408      23       3        0         -1000 blkid
){++++}
[17233]     0 17233     6022      861      16       3        0         -1000 udevd
, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17037:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
[17234]     0 17234     6022      841      16       3        0         -1000 udevd
1 lock held by blkid/17038:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17039:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by syz-executor.2/17183:
 #0:  (rtnl_mutex){+.+.}, at: [<0000000040cd6823>] dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421
1 lock held by syz-executor.1/17218:
 #0:  (rtnl_mutex){+.+.}, at: [<0000000040cd6823>] dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421
1 lock held by syz-executor.1/17224:
 #0:  (rtnl_mutex){+.+.}, at: [<0000000040cd6823>] dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421
1 lock held by udevd/17219:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by blkid/17220:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17221:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by udevd/17222:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
[17235]     0 17235     6022      841      16       3        0         -1000 udevd
1 lock held by udevd/17223:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by blkid/17226:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by udevd/17229:
 #0:  (&ei->i_mmap_sem){++++}, at: [<00000000f564af78>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178
1 lock held by blkid/17230:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by blkid/17252:
 #0:  (&mm->mmap_sem){++++}, at: [<00000000d973725f>] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1352
1 lock held by udevd/17345:
 #0:  (kernfs_mutex){+.+.}, at: [<000000002cd124e3>] kernfs_iop_permission+0x4e/0x90 fs/kernfs/inode.c:301
1 lock held by udevd/17346:
 #0:  (kernfs_mutex){+.+.}, at: [<000000002cd124e3>] kernfs_iop_permission+0x4e/0x90 fs/kernfs/inode.c:301

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

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.124+ #3
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x10e lib/dump_stack.c:53
 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101
[17236]     0 17236     6022      857      16       3        0         -1000 udevd
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 17330 Comm: blkid Not tainted 4.14.124+ #3
task: 00000000d5c54985 task.stack: 000000004e4ea3cb
RIP: 0010:hlock_class kernel/locking/lockdep.c:148 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:2376 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:2431 [inline]
RIP: 0010:__lock_acquire+0xb15/0x3fa0 kernel/locking/lockdep.c:3487
RSP: 0000:ffff88803b4df1c0 EFLAGS: 00000806
RAX: 0000000000000000 RBX: 0000000063d5b496 RCX: 00000000717820f4
RDX: 1ffff110342f83ff RSI: ffff8881a17c1fd8 RDI: 0000000000000000
RBP: ffff88803b4df380 R08: 0000000000000001 R09: 00000000000c0191
R10: ffff8881a17c1fd8 R11: 0000000000000000 R12: ffff8881a17c1ff0
R13: 00000000a5791f71 R14: 4c236992094ed407 R15: ffff8881a17c1780
FS:  00007f8757f8e740(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8c5a594000 CR3: 00000000264f8003 CR4: 00000000001606a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
Code: 3b 91 00 00 66 83 40 22 10 41 bb 01 00 00 00 e9 e0 fd ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 68 48 c1 ea 03 0f b6 04 02 <84> c0 74 28 3c 01 7f 24 48 8b 7c 24 68 44 89 5c 24 58 4c 89 94 

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/06/09 21:48 android-4.14 225970c2e89e 0159583c .config console log report ci-android-414-kasan-gce-root
* Struck through repros no longer work on HEAD.