syzbot

team0 (unregistering): Port device team_slave_1 removed
team0 (unregistering): Port device team_slave_0 removed
bond0 (unregistering): Releasing backup interface bond_slave_1
bond0 (unregistering): Releasing backup interface bond_slave_0
bond0 (unregistering): Released all slaves
INFO: task syz-executor4:24153 blocked for more than 140 seconds.
      Not tainted 5.0.0-rc2+ #26
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D26952 24153  24036 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x897/0x1e60 kernel/sched/core.c:3472
 schedule+0xfe/0x350 kernel/sched/core.c:3516
 wb_wait_for_completion+0x1e0/0x2d0 fs/fs-writeback.c:221
 sync_inodes_sb+0x335/0x490 fs/fs-writeback.c:2417
 sync_inodes_one_sb+0x57/0x70 fs/sync.c:74
 iterate_supers+0x149/0x290 fs/super.c:634
 ksys_sync+0xdf/0x1d0 fs/sync.c:113
 __ia32_sys_sync+0xe/0x20 fs/sync.c:124
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: Bad RIP value.
RSP: 002b:00007f1a5080bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 000000000073bfa8 RCX: 0000000000457ec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1a5080c6d4
R13: 00000000004c42be R14: 00000000004db5a0 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/1040:
 #0: 0000000085e820e7 (rcu_read_lock){....}, at: debug_show_all_locks+0xc6/0x41d kernel/locking/lockdep.c:4389
1 lock held by rsyslogd/7958:
 #0: 00000000972ee0e3 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1b3/0x1f0 fs/file.c:795
2 locks held by getty/8048:
 #0: 00000000e1959bdb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 000000006e9ec6b6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154
2 locks held by getty/8049:
 #0: 00000000d5d3ec97 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000701e19bc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154
2 locks held by getty/8050:
 #0: 00000000649edb47 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000cd2c2c58 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154
2 locks held by getty/8051:
 #0: 000000000cc8f3f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 000000008554df07 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154
2 locks held by getty/8052:
 #0: 00000000180103e3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 000000004d8179fb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154
2 locks held by getty/8053:
 #0: 00000000bed145a3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000c8c24ed1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154
2 locks held by getty/8054:
 #0: 0000000065ac6c58 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 0000000067bc25dc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154
5 locks held by kworker/u4:7/9551:
1 lock held by syz-executor5/15409:
1 lock held by syz-executor5/15491:
1 lock held by syz-executor5/15528:
1 lock held by syz-executor1/15542:
1 lock held by syz-executor4/24153:
 #0: 00000000700c0683 (&type->s_umount_key#55){++++}, at: iterate_supers+0xe2/0x290 fs/super.c:632

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

NMI backtrace for cpu 0
CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc2+ #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
 watchdog+0xbbb/0x1170 kernel/hung_task.c:287
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 15542 Comm: syz-executor1 Not tainted 5.0.0-rc2+ #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:snd_pcm_plugin_client_channels+0x60/0x80 sound/core/oss/pcm_plugin.c:144
Code: 48 89 da 4d 8b a4 24 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 14 4c 89 23 4c 89 e8 5b 41 5c 41 5d <5d> c3 e8 19 09 ce fb eb cd 48 89 df e8 af 09 ce fb eb e2 0f 1f 00
RSP: 0018:ffff888056a47950 EFLAGS: 00000246
RAX: 0000000000001000 RBX: ffff88808d725d00 RCX: dffffc0000000000
RDX: 1ffff1100ad48f36 RSI: ffffffff85f7d997 RDI: ffff88809e655f90
RBP: ffff888056a47950 R08: ffff88805a3d60c0 R09: ffffed100b065a09
R10: ffff888056a47ad8 R11: ffff88805832d047 R12: 0000000000001000
R13: ffff88809e655f00 R14: ffff888056a479f0 R15: 0000000000000000
FS:  00007f28ed45d700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 000000008dfe5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 snd_pcm_plug_read_transfer+0x175/0x3b0 sound/core/oss/pcm_plugin.c:643
 snd_pcm_oss_read2+0x22b/0x460 sound/core/oss/pcm_oss.c:1474
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1512 [inline]
 snd_pcm_oss_read+0x4bb/0x7f0 sound/core/oss/pcm_oss.c:2752
 __vfs_read+0x116/0xb20 fs/read_write.c:416
 vfs_read+0x194/0x3e0 fs/read_write.c:452
 ksys_read+0x105/0x260 fs/read_write.c:578
 __do_sys_read fs/read_write.c:588 [inline]
 __se_sys_read fs/read_write.c:586 [inline]
 __x64_sys_read+0x73/0xb0 fs/read_write.c:586
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f28ed45cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 0000000000000008 RSI: 0000000020000180 RDI: 0000000000000006
RBP: 000000000073c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f28ed45d6d4
R13: 00000000004c4a3d R14: 00000000004d81f8 R15: 00000000ffffffff