syzbot


INFO: task can't die in pipe_write (2)

Status: auto-closed as invalid on 2021/12/19 10:46
Reported-by: syzbot+a88ea5de960920b355b2@syzkaller.appspotmail.com
First crash: 415d, last: 415d
similar bugs (5):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task can't die in pipe_write 1 489d 463d 0/24 auto-closed as invalid on 2021/10/06 11:40
upstream INFO: task hung in rtnetlink_rcv_msg C inconclusive inconclusive 389 3d12h 1386d 0/24 upstream: reported C repro on 2019/02/22 17:00
linux-4.14 INFO: task hung in pipe_write C 1 47d 47d 0/1 upstream: reported C repro on 2022/10/24 05:45
linux-4.19 INFO: task hung in pipe_write C error 13 17d 916d 0/1 upstream: reported C repro on 2020/06/07 01:40
upstream INFO: task hung in pipe_write (4) syz error 7 315d 863d 0/24 auto-obsoleted due to no activity on 2022/10/22 17:00

Sample crash report:
INFO: task syz-executor.1:13805 can't die for more than 143 seconds.
task:syz-executor.1  state:D stack:28976 pid:13805 ppid:  6541 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4965 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6246
 schedule+0xd2/0x260 kernel/sched/core.c:6319
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6378
 __mutex_lock_common kernel/locking/mutex.c:672 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:732
 __pipe_lock fs/pipe.c:102 [inline]
 pipe_write+0x633/0x1c00 fs/pipe.c:570
 call_write_iter include/linux/fs.h:2161 [inline]
 new_sync_write+0x429/0x660 fs/read_write.c:507
 vfs_write+0x7cd/0xae0 fs/read_write.c:594
 ksys_write+0x1ee/0x250 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3d105fca39
RSP: 002b:00007f3d0db72188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3d106fff60 RCX: 00007f3d105fca39
RDX: 00000000fffffecc RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f3d10656c5f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdde39a32f R14: 00007f3d0db72300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.1:13805 blocked for more than 143 seconds.
      Not tainted 5.15.0-rc6-next-20211020-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:28976 pid:13805 ppid:  6541 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4965 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6246
 schedule+0xd2/0x260 kernel/sched/core.c:6319
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6378
 __mutex_lock_common kernel/locking/mutex.c:672 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:732
 __pipe_lock fs/pipe.c:102 [inline]
 pipe_write+0x633/0x1c00 fs/pipe.c:570
 call_write_iter include/linux/fs.h:2161 [inline]
 new_sync_write+0x429/0x660 fs/read_write.c:507
 vfs_write+0x7cd/0xae0 fs/read_write.c:594
 ksys_write+0x1ee/0x250 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3d105fca39
RSP: 002b:00007f3d0db72188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3d106fff60 RCX: 00007f3d105fca39
RDX: 00000000fffffecc RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f3d10656c5f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdde39a32f R14: 00007f3d0db72300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.1:13810 can't die for more than 143 seconds.
task:syz-executor.1  state:D stack:27528 pid:13810 ppid:  6541 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4965 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6246
 schedule+0xd2/0x260 kernel/sched/core.c:6319
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6378
 __mutex_lock_common kernel/locking/mutex.c:672 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:732
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x3be/0xb80 net/core/rtnetlink.c:5569
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2491
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 sock_no_sendpage+0xf6/0x140 net/core/sock.c:3080
 kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3504
 kernel_sendpage net/socket.c:3501 [inline]
 sock_sendpage+0xe5/0x140 net/socket.c:1003
 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364
 splice_from_pipe_feed fs/splice.c:418 [inline]
 __splice_from_pipe+0x43e/0x8a0 fs/splice.c:562
 splice_from_pipe fs/splice.c:597 [inline]
 generic_splice_sendpage+0xd4/0x140 fs/splice.c:746
 do_splice_from fs/splice.c:767 [inline]
 do_splice+0xb7e/0x1960 fs/splice.c:1079
 __do_splice+0x134/0x250 fs/splice.c:1144
 __do_sys_splice fs/splice.c:1350 [inline]
 __se_sys_splice fs/splice.c:1332 [inline]
 __x64_sys_splice+0x198/0x250 fs/splice.c:1332
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3d105fca39
RSP: 002b:00007f3d0db51188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f3d10700020 RCX: 00007f3d105fca39
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f3d10656c5f R08: 000000000004ffe2 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdde39a32f R14: 00007f3d0db51300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.1:13810 blocked for more than 144 seconds.
      Not tainted 5.15.0-rc6-next-20211020-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:27528 pid:13810 ppid:  6541 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4965 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6246
 schedule+0xd2/0x260 kernel/sched/core.c:6319
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6378
 __mutex_lock_common kernel/locking/mutex.c:672 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:732
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x3be/0xb80 net/core/rtnetlink.c:5569
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2491
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 sock_no_sendpage+0xf6/0x140 net/core/sock.c:3080
 kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3504
 kernel_sendpage net/socket.c:3501 [inline]
 sock_sendpage+0xe5/0x140 net/socket.c:1003
 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364
 splice_from_pipe_feed fs/splice.c:418 [inline]
 __splice_from_pipe+0x43e/0x8a0 fs/splice.c:562
 splice_from_pipe fs/splice.c:597 [inline]
 generic_splice_sendpage+0xd4/0x140 fs/splice.c:746
 do_splice_from fs/splice.c:767 [inline]
 do_splice+0xb7e/0x1960 fs/splice.c:1079
 __do_splice+0x134/0x250 fs/splice.c:1144
 __do_sys_splice fs/splice.c:1350 [inline]
 __se_sys_splice fs/splice.c:1332 [inline]
 __x64_sys_splice+0x198/0x250 fs/splice.c:1332
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3d105fca39
RSP: 002b:00007f3d0db51188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f3d10700020 RCX: 00007f3d105fca39
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f3d10656c5f R08: 000000000004ffe2 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdde39a32f R14: 00007f3d0db51300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.0:13804 can't die for more than 144 seconds.
task:syz-executor.0  state:D stack:26440 pid:13804 ppid:  6539 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4965 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6246
 schedule+0xd2/0x260 kernel/sched/core.c:6319
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 dev_deactivate_many+0x710/0xc60 net/sched/sch_generic.c:1302
 dev_deactivate+0xe9/0x1b0 net/sched/sch_generic.c:1312
 qdisc_graft+0xdac/0x1260 net/sched/sch_api.c:1061
 tc_modify_qdisc+0xb92/0x1980 net/sched/sch_api.c:1671
 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2491
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x331/0x810 net/socket.c:2409
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463
 __sys_sendmmsg+0x195/0x470 net/socket.c:2549
 __do_sys_sendmmsg net/socket.c:2578 [inline]
 __se_sys_sendmmsg net/socket.c:2575 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2575
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fe74d798a39
RSP: 002b:00007fe74ad0e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fe74d89bf60 RCX: 00007fe74d798a39
RDX: 0492492492492805 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 00007fe74d7f2c5f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe8f32634f R14: 00007fe74ad0e300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/1:0/20:
 #0: ffff88814a6e3138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff88814a6e3138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff88814a6e3138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
 #0: ffff88814a6e3138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline]
 #0: ffff88814a6e3138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
 #0: ffff88814a6e3138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2268
 #1: ffffc90000da7db0 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2272
 #2: ffffffff8d2fcb68 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4590
1 lock held by khungtaskd/27:
 #0: ffffffff8bb835a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
6 locks held by kworker/u4:4/983:
1 lock held by in:imklog/6229:
 #0: ffff888014ffeaf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
3 locks held by kworker/0:18/9451:
 #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+0x896/0x1690 kernel/workqueue.c:2268
 #1: ffffc9001864fdb0 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2272
 #2: ffffffff8d2fcb68 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74
1 lock held by syz-executor.1/13805:
 #0: ffff8880719cd068 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:102 [inline]
 #0: ffff8880719cd068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_write+0x633/0x1c00 fs/pipe.c:570
2 locks held by syz-executor.1/13810:
 #0: ffff8880719cd068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:81 [inline]
 #0: ffff8880719cd068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock+0x5a/0x70 fs/pipe.c:89
 #1: ffffffff8d2fcb68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #1: ffffffff8d2fcb68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3be/0xb80 net/core/rtnetlink.c:5569
1 lock held by syz-executor.0/13804:
 #0: ffffffff8d2fcb68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d2fcb68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3be/0xb80 net/core/rtnetlink.c:5569

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc6-next-20211020-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __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:254 [inline]
 watchdog+0xcb7/0xed0 kernel/hung_task.c:339
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8544 Comm: kworker/u4:6 Not tainted 5.15.0-rc6-next-20211020-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:strlen+0x54/0x90 lib/string.c:487
Code: 75 48 80 7d 00 00 74 39 48 bb 00 00 00 00 00 fc ff df 48 89 e8 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a <38> ca 7f 04 84 d2 75 1f 80 38 00 75 de 48 83 c4 08 48 29 e8 5b 5d
RSP: 0018:ffffc90016537820 EFLAGS: 00000246
RAX: ffffffff89a95628 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff888010daf138 RDI: ffffffff89a95620
RBP: ffffffff89a95620 R08: 0000000000000000 R09: ffffffff8d8febd7
R10: fffffbfff1b1fd7a R11: 000000000000003f R12: ffff888010daf138
R13: ffffffff8ba808a0 R14: ffff888010daf138 R15: ffffc900165378f0
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa0e8c11028 CR3: 000000000b88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 strlen include/linux/fortify-string.h:102 [inline]
 trace_event_get_offsets_lock include/trace/events/lock.h:39 [inline]
 perf_trace_lock+0xb1/0x4d0 include/trace/events/lock.h:39
 trace_lock_release include/trace/events/lock.h:58 [inline]
 lock_release+0x4a8/0x720 kernel/locking/lockdep.c:5648
 __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline]
 _raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:407 [inline]
 __text_poke+0x5d4/0x8c0 arch/x86/kernel/alternative.c:876
 text_poke_bp_batch+0x2eb/0x560 arch/x86/kernel/alternative.c:1127
 text_poke_flush arch/x86/kernel/alternative.c:1268 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:1265 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1275
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x1d5/0x430 kernel/jump_label.c:830
 static_key_disable_cpuslocked+0x152/0x1b0 kernel/jump_label.c:207
 static_key_disable+0x16/0x20 kernel/jump_label.c:215
 toggle_allocation_gate mm/kfence/core.c:745 [inline]
 toggle_allocation_gate+0x183/0x390 mm/kfence/core.c:723
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	75 48                	jne    0x4a
   2:	80 7d 00 00          	cmpb   $0x0,0x0(%rbp)
   6:	74 39                	je     0x41
   8:	48 bb 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbx
   f:	fc ff df
  12:	48 89 e8             	mov    %rbp,%rax
  15:	48 83 c0 01          	add    $0x1,%rax
  19:	48 89 c2             	mov    %rax,%rdx
  1c:	48 89 c1             	mov    %rax,%rcx
  1f:	48 c1 ea 03          	shr    $0x3,%rdx
  23:	83 e1 07             	and    $0x7,%ecx
  26:	0f b6 14 1a          	movzbl (%rdx,%rbx,1),%edx
* 2a:	38 ca                	cmp    %cl,%dl <-- trapping instruction
  2c:	7f 04                	jg     0x32
  2e:	84 d2                	test   %dl,%dl
  30:	75 1f                	jne    0x51
  32:	80 38 00             	cmpb   $0x0,(%rax)
  35:	75 de                	jne    0x15
  37:	48 83 c4 08          	add    $0x8,%rsp
  3b:	48 29 e8             	sub    %rbp,%rax
  3e:	5b                   	pop    %rbx
  3f:	5d                   	pop    %rbp

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-linux-next-kasan-gce-root 2021/10/20 10:46 linux-next 51dba6e335ff 418a00eb .config log report info INFO: task can't die in pipe_write
* Struck through repros no longer work on HEAD.