INFO: task hung in btrfs_buffered_write

Status: auto-obsoleted due to no activity on 2024/04/15 13:23
Subsystems: btrfs
[Documentation on labels]
First crash: 1260d, last: 940d
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in btrfs_buffered_write 1 1 794d 794d 0/3 auto-obsoleted due to no activity on 2024/09/18 15:10
linux-5.15 INFO: task hung in btrfs_buffered_write 1 1 1032d 1032d 0/3 auto-obsoleted due to no activity on 2024/01/24 05:32

Sample crash report:
INFO: task syz-executor.3:11974 blocked for more than 143 seconds.
      Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:23696 pid:11974 tgid:11881 ppid:6822   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x177f/0x4960 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6817
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
 rwsem_down_write_slowpath+0xeea/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
 inode_lock include/linux/fs.h:802 [inline]
 btrfs_inode_lock+0x4d/0xd0 fs/btrfs/inode.c:387
 btrfs_buffered_write+0x230/0x1380 fs/btrfs/file.c:1207
 btrfs_do_write_iter+0x2bb/0x1190 fs/btrfs/file.c:1690
 call_write_iter include/linux/fs.h:2085 [inline]
 iter_file_splice_write+0xa64/0x1320 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0xf6/0x1e0 fs/splice.c:1164
 splice_direct_to_actor+0x54e/0xc80 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x28c/0x3e0 fs/splice.c:1233
 do_sendfile+0x56d/0xdb0 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fdff647cda9
RSP: 002b:00007fdff71180c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fdff65ac050 RCX: 00007fdff647cda9
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00007fdff64c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0001000000201005 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fdff65ac050 R15: 00007fff3aa3a478
 </TASK>
INFO: task syz-executor.3:11981 blocked for more than 144 seconds.
      Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:24136 pid:11981 tgid:11881 ppid:6822   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x177f/0x4960 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6817
 wait_extent_bit fs/btrfs/extent-io-tree.c:822 [inline]
 lock_extent+0x69d/0x850 fs/btrfs/extent-io-tree.c:1868
 btrfs_page_mkwrite+0x743/0x10c0 fs/btrfs/inode.c:8176
 do_page_mkwrite+0x197/0x470 mm/memory.c:2966
 wp_page_shared mm/memory.c:3353 [inline]
 do_wp_page+0x20e3/0x4c80 mm/memory.c:3493
 handle_pte_fault mm/memory.c:5160 [inline]
 __handle_mm_fault+0x26a3/0x72b0 mm/memory.c:5285
 handle_mm_fault+0x27e/0x770 mm/memory.c:5450
 do_user_addr_fault arch/x86/mm/fault.c:1415 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x2ad/0x870 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
RSP: 0018:ffffc9000a987530 EFLAGS: 00050206
RAX: 0000000000000000 RBX: 0000000020000218 RCX: 0000000000000038
RDX: 0000000000000000 RSI: ffffc9000a9875e0 RDI: 00000000200001e0
RBP: ffffc9000a987690 R08: ffffc9000a987617 R09: 1ffff92001530ec2
R10: dffffc0000000000 R11: fffff52001530ec3 R12: 0000000000000038
R13: ffffc9000a9875e0 R14: 00000000200001e0 R15: ffffc9000a9875e0
 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline]
 _copy_to_user+0x86/0xa0 lib/usercopy.c:41
 copy_to_user include/linux/uaccess.h:191 [inline]
 fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145
 emit_last_fiemap_cache fs/btrfs/extent_io.c:2555 [inline]
 extent_fiemap+0x1b9c/0x1fe0 fs/btrfs/extent_io.c:3082
 btrfs_fiemap+0x178/0x1e0 fs/btrfs/inode.c:7844
 ioctl_fiemap fs/ioctl.c:220 [inline]
 do_vfs_ioctl+0x19ea/0x2b40 fs/ioctl.c:811
 __do_sys_ioctl fs/ioctl.c:869 [inline]
 __se_sys_ioctl+0x81/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fdff647cda9
RSP: 002b:00007fdff57de0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdff65ac1f0 RCX: 00007fdff647cda9
RDX: 00000000200001c0 RSI: 00000000c020660b RDI: 0000000000000006
RBP: 00007fdff64c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fdff65ac1f0 R15: 00007fff3aa3a478
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x310 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfaf/0xff0 kernel/hung_task.c:379
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12962 Comm: udevd Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:list_empty include/linux/list.h:373 [inline]
RIP: 0010:ep_is_linked fs/eventpoll.c:361 [inline]
RIP: 0010:ep_poll_callback+0x380/0xb10 fs/eventpoll.c:1206
Code: 7d ff e9 23 02 00 00 4c 8b 64 24 18 49 8d 5c 24 18 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 33 38 da ff 48 8b 03 <48> 39 d8 74 39 e8 b6 a5 7d ff e9 fb 01 00 00 4c 89 ff be 08 00 00
RSP: 0018:ffffc90005be7800 EFLAGS: 00000046
RAX: ffff888021588418 RBX: ffff888021588418 RCX: ffff88802a6ad940
RDX: ffff88802a6ad940 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90005be78f8 R08: ffffffff8211476f R09: 1ffff1100f3c4828
R10: dffffc0000000000 R11: ffffed100f3c4829 R12: ffff888021588400
R13: ffff888079e24000 R14: ffff888021588448 R15: dffffc0000000000
FS:  00007f827a4bfc80(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055efb1902ef0 CR3: 0000000029780000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock+0x12d/0x1e0 kernel/sched/wait.c:106
 sock_def_readable+0x1ea/0x450 net/core/sock.c:3342
 unix_dgram_sendmsg+0x1614/0x2200 net/unix/af_unix.c:2114
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x39a/0x520 net/socket.c:1160
 call_write_iter include/linux/fs.h:2085 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x783/0xaf0 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f827a116bf2
Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007fff287e0158 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f827a116bf2
RDX: 0000000000000000 RSI: 00007fff287e01af RDI: 000000000000000a
RBP: 00007fff287e01af R08: 0000000000000001 R09: 0000000000000000
R10: 000000000000010f R11: 0000000000000246 R12: 000000000000000a
R13: 00007f827a4bfae0 R14: 0000000000000000 R15: 000055efb18e3910
 </TASK>

Crashes (14):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/01/16 13:22 upstream 052d534373b7 2a7bcc7f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2024/01/10 17:14 upstream ab27740f7665 04815ef1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/12/27 04:21 upstream fbafc3e621c3 fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/10/04 23:20 upstream cbf3a2cb156a b7d7ff54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/07/19 16:42 upstream ccff6d117d8d 022df2bb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/07/05 23:44 upstream d528014517f2 ba5dba36 .config console log report info ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/05/27 02:49 upstream 0d85b27b0cc6 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/04/18 11:34 upstream 6a8f57ae2eb0 436577a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/04/14 01:53 upstream de4664485abb 3cfcaa1b .config console log report info ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/04/09 11:49 upstream cdc9718d5e59 71147e29 .config console log report info ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/04/08 15:30 upstream aa318c48808c 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/03/26 08:39 upstream da8e7da11e4b fbf0499a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/03/02 13:36 upstream ee3f96b16468 f8902b57 .config console log report info ci2-upstream-fs INFO: task hung in btrfs_buffered_write
2023/08/07 01:12 linux-next bdffb18b5dd8 4ffcc9ef .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in btrfs_buffered_write
* Struck through repros no longer work on HEAD.