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Date:   Sat, 13 Jul 2019 21:07:05 -0700
From:   syzbot <syzbot+0f1827363a305f74996f@...kaller.appspotmail.com>
To:     davem@...emloft.net, linux-can@...r.kernel.org,
        linux-kernel@...r.kernel.org, mkl@...gutronix.de,
        netdev@...r.kernel.org, socketcan@...tkopp.net,
        syzkaller-bugs@...glegroups.com
Subject: Re: INFO: task hung in unregister_netdevice_notifier (3)

syzbot has found a reproducer for the following crash on:

HEAD commit:    a2d79c71 Merge tag 'for-5.3/io_uring-20190711' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10e45f0fa00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3539b1747f03988e
dashboard link: https://syzkaller.appspot.com/bug?extid=0f1827363a305f74996f
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1765c52fa00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+0f1827363a305f74996f@...kaller.appspotmail.com

INFO: task syz-executor.4:9527 blocked for more than 143 seconds.
       Not tainted 5.2.0+ #80
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28136  9527   9356 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3252 [inline]
  __schedule+0x755/0x1580 kernel/sched/core.c:3878
  schedule+0xa8/0x270 kernel/sched/core.c:3942
  rwsem_down_write_slowpath+0x70a/0xf70 kernel/locking/rwsem.c:1198
  __down_write kernel/locking/rwsem.c:1349 [inline]
  down_write+0x13c/0x150 kernel/locking/rwsem.c:1485
  unregister_netdevice_notifier+0x7e/0x390 net/core/dev.c:1713
  bcm_release+0x93/0x5e0 net/can/bcm.c:1525
  __sock_release+0xce/0x280 net/socket.c:586
  sock_close+0x1e/0x30 net/socket.c:1264
  __fput+0x2ff/0x890 fs/file_table.c:280
  ____fput+0x16/0x20 fs/file_table.c:313
  task_work_run+0x145/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:185 [inline]
  exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413501
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48  
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48  
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:0000000000a6fbc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413501
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 0000000000a6fca0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 00000000007619c8 R15: ffffffffffffffff
INFO: task syz-executor.2:9528 blocked for more than 145 seconds.
       Not tainted 5.2.0+ #80
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D28136  9528   9354 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3252 [inline]
  __schedule+0x755/0x1580 kernel/sched/core.c:3878
  schedule+0xa8/0x270 kernel/sched/core.c:3942
  rwsem_down_write_slowpath+0x70a/0xf70 kernel/locking/rwsem.c:1198
  __down_write kernel/locking/rwsem.c:1349 [inline]
  down_write+0x13c/0x150 kernel/locking/rwsem.c:1485
  unregister_netdevice_notifier+0x7e/0x390 net/core/dev.c:1713
  bcm_release+0x93/0x5e0 net/can/bcm.c:1525
  __sock_release+0xce/0x280 net/socket.c:586
  sock_close+0x1e/0x30 net/socket.c:1264
  __fput+0x2ff/0x890 fs/file_table.c:280
  ____fput+0x16/0x20 fs/file_table.c:313
  task_work_run+0x145/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:185 [inline]
  exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413501
Code: 5f fe ff ff 31 c9 31 f6 41 b9 b0 20 41 00 41 b8 8c d6 65 00 ba 02 00  
00 00 bf 28 38 44 00 ff 15 7d a1 24 00 85 c0 0f 85 37 fe <ff> ff 31 c9 31  
f6 41 b9 b0 20 41 00 41 b8 90 d6 65 00 ba 03 00 00
RSP: 002b:0000000000a6fbc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413501
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 0000000000a6fca0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 00000000007619c8 R15: ffffffffffffffff
INFO: task syz-executor.0:9529 blocked for more than 147 seconds.
       Not tainted 5.2.0+ #80
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D28136  9529   9353 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3252 [inline]
  __schedule+0x755/0x1580 kernel/sched/core.c:3878
  schedule+0xa8/0x270 kernel/sched/core.c:3942
  rwsem_down_write_slowpath+0x70a/0xf70 kernel/locking/rwsem.c:1198
  __down_write kernel/locking/rwsem.c:1349 [inline]
  down_write+0x13c/0x150 kernel/locking/rwsem.c:1485
  unregister_netdevice_notifier+0x7e/0x390 net/core/dev.c:1713
  bcm_release+0x93/0x5e0 net/can/bcm.c:1525
  __sock_release+0xce/0x280 net/socket.c:586
  sock_close+0x1e/0x30 net/socket.c:1264
  __fput+0x2ff/0x890 fs/file_table.c:280
  ____fput+0x16/0x20 fs/file_table.c:313
  task_work_run+0x145/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:185 [inline]
  exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413501
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48  
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48  
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:0000000000a6fbc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413501
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 0000000000a6fca0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 00000000007619c8 R15: ffffffffffffffff
INFO: task syz-executor.5:9533 blocked for more than 148 seconds.
       Not tainted 5.2.0+ #80
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D28136  9533   9358 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3252 [inline]
  __schedule+0x755/0x1580 kernel/sched/core.c:3878
  schedule+0xa8/0x270 kernel/sched/core.c:3942
  rwsem_down_write_slowpath+0x70a/0xf70 kernel/locking/rwsem.c:1198
  __down_write kernel/locking/rwsem.c:1349 [inline]
  down_write+0x13c/0x150 kernel/locking/rwsem.c:1485
  unregister_netdevice_notifier+0x7e/0x390 net/core/dev.c:1713
  bcm_release+0x93/0x5e0 net/can/bcm.c:1525
  __sock_release+0xce/0x280 net/socket.c:586
  sock_close+0x1e/0x30 net/socket.c:1264
  __fput+0x2ff/0x890 fs/file_table.c:280
  ____fput+0x16/0x20 fs/file_table.c:313
  task_work_run+0x145/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:185 [inline]
  exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413501
Code: 5f fe ff ff 31 c9 31 f6 41 b9 b0 20 41 00 41 b8 8c d6 65 00 ba 02 00  
00 00 bf 28 38 44 00 ff 15 7d a1 24 00 85 c0 0f 85 37 fe <ff> ff 31 c9 31  
f6 41 b9 b0 20 41 00 41 b8 90 d6 65 00 ba 03 00 00
RSP: 002b:0000000000a6fbc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413501
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 0000000000a6fca0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 00000000007619c8 R15: ffffffffffffffff
INFO: task syz-executor.1:9534 blocked for more than 148 seconds.
       Not tainted 5.2.0+ #80
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D28136  9534   9359 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3252 [inline]
  __schedule+0x755/0x1580 kernel/sched/core.c:3878
  schedule+0xa8/0x270 kernel/sched/core.c:3942
  rwsem_down_write_slowpath+0x70a/0xf70 kernel/locking/rwsem.c:1198
  __down_write kernel/locking/rwsem.c:1349 [inline]
  down_write+0x13c/0x150 kernel/locking/rwsem.c:1485
  unregister_netdevice_notifier+0x7e/0x390 net/core/dev.c:1713
  bcm_release+0x93/0x5e0 net/can/bcm.c:1525
  __sock_release+0xce/0x280 net/socket.c:586
  sock_close+0x1e/0x30 net/socket.c:1264
  __fput+0x2ff/0x890 fs/file_table.c:280
  ____fput+0x16/0x20 fs/file_table.c:313
  task_work_run+0x145/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:185 [inline]
  exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413501
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48  
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48  
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:0000000000a6fbc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413501
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 0000000000a6fca0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 00000000007619c8 R15: ffffffffffffffff
INFO: task syz-executor.3:9535 blocked for more than 150 seconds.
       Not tainted 5.2.0+ #80
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D28136  9535   9351 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:3252 [inline]
  __schedule+0x755/0x1580 kernel/sched/core.c:3878
  schedule+0xa8/0x270 kernel/sched/core.c:3942
  rwsem_down_write_slowpath+0x70a/0xf70 kernel/locking/rwsem.c:1198
  __down_write kernel/locking/rwsem.c:1349 [inline]
  down_write+0x13c/0x150 kernel/locking/rwsem.c:1485
  unregister_netdevice_notifier+0x7e/0x390 net/core/dev.c:1713
  bcm_release+0x93/0x5e0 net/can/bcm.c:1525
  __sock_release+0xce/0x280 net/socket.c:586
  sock_close+0x1e/0x30 net/socket.c:1264
  __fput+0x2ff/0x890 fs/file_table.c:280
  ____fput+0x16/0x20 fs/file_table.c:313
  task_work_run+0x145/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:185 [inline]
  exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413501
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48  
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48  
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:0000000000a6fbc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413501
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 0000000000a6fca0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 00000000007619c8 R15: ffffffffffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/1049:
  #0: 00000000ede263b0 (rcu_read_lock){....}, at:  
debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5257
1 lock held by rsyslogd/9208:
  #0: 00000000da20b59a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110  
fs/file.c:801
2 locks held by getty/9298:
  #0: 00000000e9efae0d (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
  #1: 0000000007287a12 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9299:
  #0: 00000000ad0733b0 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
  #1: 0000000094dd5193 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9300:
  #0: 00000000692c340f (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
  #1: 00000000538c7d7d (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9301:
  #0: 00000000116ea6c7 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
  #1: 00000000a908a9f7 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9302:
  #0: 0000000042704f01 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
  #1: 0000000041cc8671 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9303:
  #0: 000000001ef3b293 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
  #1: 000000008b703302 (&ldata->atomic_read_lock){+.+.}, at:  
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/9304:
  #0: 0000000095601bb0 (&tty->ldisc_sem){++++}, at:  
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341

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