INFO: task hung in pipe_write

Status: upstream: reported C repro on 2022/10/24 05:45
Reported-by: syzbot+9f85f2f66d1766cbad33@syzkaller.appspotmail.com
First crash: 1377d, last: 1260d
▶ ▼ Similar bugs (15)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in pipe_write (3) fs 1 1 2379d 2379d 0/29 auto-closed as invalid on 2020/04/25 05:37
android-44 INFO: task hung in pipe_write 1 1 2794d 2666d 0/2 auto-closed as invalid on 2019/06/05 06:19
upstream INFO: task hung in pipe_write (5) fs 1 4 622d 662d 0/29 auto-obsoleted due to no activity on 2025/02/15 05:49
android-6-12 INFO: task hung in pipe_write origin:upstream 1 syz, C 5 273d 328d 0/1 auto-obsoleted due to no activity on 2026/02/21 10:27
upstream INFO: task hung in rtnetlink_rcv_msg net 1 syz, C inconclusive inconclusive 1970 753d 2716d 26/29 fixed on 2024/07/09 19:14
upstream INFO: task hung in pipe_write (2) ext4 1 syz, C done 6 2508d 2507d 0/29 closed as invalid on 2019/09/28 02:25
upstream INFO: task hung in pipe_write fs 1 8 2738d 2852d 0/29 auto-closed as invalid on 2019/07/30 21:09
android-44 INFO: task hung in pipe_write (2) 1 1 2434d 2434d 0/2 auto-closed as invalid on 2020/03/31 01:26
android-49 INFO: task hung in pipe_write 1 syz, C 3 2460d 2666d 0/3 public: reported C repro on 2019/04/14 08:51
linux-4.19 INFO: task hung in pipe_write 1 syz, C error 13 1347d 2246d 0/1 upstream: reported C repro on 2020/06/07 01:40
upstream INFO: task hung in pipe_write (6) kernfs netfs 1 syz, C done done 10 306d 529d 0/29 auto-obsoleted due to no activity on 2026/01/07 06:32
upstream INFO: task hung in pipe_write (4) fs 1 syz error 7 1646d 2193d 0/29 auto-obsoleted due to no activity on 2022/10/22 17:00
android-414 INFO: task hung in pipe_write 1 1 2482d 2482d 0/1 auto-closed as invalid on 2020/02/11 22:17
upstream INFO: task can't die in pipe_write (2) fs 1 1 1746d 1742d 0/29 auto-closed as invalid on 2021/12/19 10:46
upstream INFO: task can't die in pipe_write fs 1 1 1820d 1793d 0/29 auto-closed as invalid on 2021/10/06 11:40
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2023/02/18 09:31 37m bisect fix linux-4.14.y OK (0) job log log
2023/01/19 09:05 25m bisect fix linux-4.14.y OK (0) job log log

Sample crash report:
INFO: task syz-executor285:7977 blocked for more than 140 seconds.
      Not tainted 4.14.295-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor285 D28056  7977   7975 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3387
 schedule+0x8d/0x1b0 kernel/sched/core.c:3431
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 pipe_lock_nested fs/pipe.c:82 [inline]
 pipe_lock fs/pipe.c:90 [inline]
 pipe_wait+0x171/0x190 fs/pipe.c:138
 pipe_write+0x510/0xe10 fs/pipe.c:505
 call_write_iter include/linux/fs.h:1780 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x44c/0x630 fs/read_write.c:482
 vfs_write+0x17f/0x4d0 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xf2/0x210 fs/read_write.c:582
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f11663f7b29
RSP: 002b:00007f11663a92f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f116647f428 RCX: 00007f11663f7b29
RDX: 00000000fffffecc RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f116647f420
R13: 00007fffa7a56e2f R14: 00007f116647f42c R15: 00007f116644d074

Showing all locks held in the system:
1 lock held by khungtaskd/1533:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff87024c59>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
1 lock held by syz-executor285/7977:
 #0:  (&pipe->mutex/1){+.+.}, at: [<ffffffff8188b7b1>] pipe_lock_nested fs/pipe.c:82 [inline]
 #0:  (&pipe->mutex/1){+.+.}, at: [<ffffffff8188b7b1>] pipe_lock fs/pipe.c:90 [inline]
 #0:  (&pipe->mutex/1){+.+.}, at: [<ffffffff8188b7b1>] pipe_wait+0x171/0x190 fs/pipe.c:138

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

NMI backtrace for cpu 0
CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.295-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
 watchdog+0x5b9/0xb40 kernel/hung_task.c:274
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7978 Comm: syz-executor285 Not tainted 4.14.295-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
task: ffff8880b377a0c0 task.stack: ffff8880b3348000
RIP: 0010:__orc_find+0x5b/0xf0 arch/x86/kernel/unwind_orc.c:47
RSP: 0018:ffff8880b334ef58 EFLAGS: 00000202
RAX: 000000000000000d RBX: 1ffff11016669dfb RCX: ffffffff817ec6d7
RDX: 000000000000000d RSI: ffffffff8a725fd2 RDI: ffffffff8a1947e8
RBP: ffffffff8a1947e8 R08: ffffffff8a725fd2 R09: ffffffff8a726026
R10: 000000000001e6a7 R11: 0000000000066071 R12: ffffffff8a19481c
R13: ffffffff8a1947e8 R14: ffffffff8a1947e8 R15: dffffc0000000000
FS:  00007f1166388700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fefefd9b000 CR3: 00000000b0a68000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 orc_find arch/x86/kernel/unwind_orc.c:118 [inline]
 unwind_next_frame+0x59a/0x17d0 arch/x86/kernel/unwind_orc.c:348
 __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc_node_trace+0x153/0x400 mm/slab.c:3661
 __do_kmalloc_node mm/slab.c:3681 [inline]
 __kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3696
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 pskb_expand_head+0x128/0xd30 net/core/skbuff.c:1472
 netlink_trim+0x1ae/0x220 net/netlink/af_netlink.c:1278
 netlink_unicast+0x94/0x610 net/netlink/af_netlink.c:1312
 ip_set_protocol+0x386/0x500 net/netfilter/ipset/ip_set_core.c:1812
 nfnetlink_rcv_msg+0x9bb/0xc00 net/netfilter/nfnetlink.c:214
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2454
 nfnetlink_rcv+0x1ab/0x1da0 net/netfilter/nfnetlink.c:515
 netlink_unicast_kernel net/netlink/af_netlink.c:1296 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1322
 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1893
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 sock_no_sendpage+0xe2/0x110 net/core/sock.c:2610
 kernel_sendpage net/socket.c:3407 [inline]
 sock_sendpage+0xdf/0x140 net/socket.c:871
 pipe_to_sendpage+0x226/0x2d0 fs/splice.c:451
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x326/0x7a0 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 generic_splice_sendpage+0xc1/0x110 fs/splice.c:832
 do_splice_from fs/splice.c:851 [inline]
 do_splice fs/splice.c:1145 [inline]
 SYSC_splice fs/splice.c:1400 [inline]
 SyS_splice+0xd59/0x1380 fs/splice.c:1380
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f11663f7b29
RSP: 002b:00007f11663882e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f116647f438 RCX: 00007f11663f7b29
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 000000000000001e R08: 000000000004ffe6 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f116647f430
R13: 00007f116647d140 R14: 00007f116647f43c R15: 00007f116644d074
Code: fc ff df 49 89 fe 48 89 fd eb 0c 48 8d 6b 04 49 89 de 49 39 ec 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 <48> d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 48

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/24 05:44 linux-4.14.y 9d5c0b3a8e1a 23bf86af .config console log report syz C [disk image] [vmlinux] ci2-linux-4-14 INFO: task hung in pipe_write
* Struck through repros no longer work on HEAD.