syzbot


INFO: task hung in fuse_flush (2)

Status: auto-closed as invalid on 2022/01/24 04:40
Reported-by: syzbot+1260eecded42ddd41d2a@syzkaller.appspotmail.com
First crash: 1152d, last: 1152d
Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in fuse_flush 1 1344d 1344d 0/1 auto-closed as invalid on 2021/07/16 16:14
upstream INFO: task hung in fuse_flush (2) fuse 2 667d 676d 0/28 auto-obsoleted due to no activity on 2023/04/24 00:25
upstream INFO: task hung in fuse_flush fuse 2 1112d 1200d 0/28 auto-closed as invalid on 2022/02/03 03:15
linux-5.15 INFO: task hung in fuse_flush 1 151d 151d 0/3 auto-obsoleted due to no activity on 2024/09/30 23:08
linux-4.14 INFO: task hung in fuse_flush C inconclusive 19 708d 1029d 0/1 upstream: reported C repro on 2022/01/26 21:17
linux-4.19 INFO: task hung in fuse_flush (3) 109 667d 1029d 0/1 upstream: reported on 2022/01/27 11:57
upstream INFO: task hung in fuse_flush (3) fuse 1 420d 420d 0/28 auto-obsoleted due to no activity on 2023/12/26 21:09

Sample crash report:
ieee802154 phy0 wpan0: encryption failed: -22
ieee802154 phy1 wpan1: encryption failed: -22
Bluetooth: hci2: command 0x0406 tx timeout
ieee802154 phy0 wpan0: encryption failed: -22
ieee802154 phy1 wpan1: encryption failed: -22
INFO: task syz-executor.5:31016 blocked for more than 140 seconds.
      Not tainted 4.19.207-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D28648 31016   8144 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline]
 rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618
 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117
 __down_write arch/x86/include/asm/rwsem.h:142 [inline]
 down_write+0x4f/0x90 kernel/locking/rwsem.c:72
 inode_lock include/linux/fs.h:748 [inline]
 fuse_flush+0x1fd/0x5b0 fs/fuse/file.c:421
 filp_close+0xb4/0x160 fs/open.c:1162
 __close_fd+0x133/0x200 fs/file.c:636
 __do_sys_close fs/open.c:1181 [inline]
 __se_sys_close fs/open.c:1179 [inline]
 __x64_sys_close+0x69/0x100 fs/open.c:1179
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f07a726a51b
Code: Bad RIP value.
RSP: 002b:00007ffe8942f990 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f07a726a51b
RDX: 0000001b30b28064 RSI: ffffffff83772911 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b30b278d0
R10: 0000000000000948 R11: 0000000000000293 R12: 00007f07a73bcb60
R13: 00007f07a73bcb60 R14: 00007f07a73bbf60 R15: 00000000000f7911
INFO: task syz-executor.5:31026 blocked for more than 140 seconds.
      Not tainted 4.19.207-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D28800 31026   8144 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 fuse_wait_on_page_writeback fs/fuse/file.c:383 [inline]
 fuse_wait_on_page_writeback.isra.0+0x11b/0x170 fs/fuse/file.c:379
 fuse_launder_page fs/fuse/file.c:2033 [inline]
 fuse_launder_page+0xb6/0xe0 fs/fuse/file.c:2026
 do_launder_page mm/truncate.c:655 [inline]
 invalidate_inode_pages2_range+0x795/0x1110 mm/truncate.c:725
 fuse_finish_open+0x2e2/0x590 fs/fuse/file.c:182
 fuse_open_common+0x254/0x2c0 fs/fuse/file.c:222
 do_dentry_open+0x4aa/0x1160 fs/open.c:796
 do_last fs/namei.c:3421 [inline]
 path_openat+0x793/0x2df0 fs/namei.c:3537
 do_filp_open+0x18c/0x3f0 fs/namei.c:3567
 do_sys_open+0x3b3/0x520 fs/open.c:1085
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f07a72b7709
Code: Bad RIP value.
RSP: 002b:00007f07a480d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f07a73bc020 RCX: 00007f07a72b7709
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000100
RBP: 00007f07a7311cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe8942f92f R14: 00007f07a480d300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/1571:
 #0: 00000000fc65ef2b (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
1 lock held by systemd-journal/4692:
1 lock held by in:imklog/7786:
 #0: 000000003ee33265 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
1 lock held by syz-executor.5/31016:
 #0: 00000000cf7deaaf (&sb->s_type->i_mutex_key#31){+.+.}, at: inode_lock include/linux/fs.h:748 [inline]
 #0: 00000000cf7deaaf (&sb->s_type->i_mutex_key#31){+.+.}, at: fuse_flush+0x1fd/0x5b0 fs/fuse/file.c:421
2 locks held by syz-executor.5/31026:
 #0: 00000000b706bf09 (sb_writers#24){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline]
 #0: 00000000b706bf09 (sb_writers#24){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360
 #1: 00000000cf7deaaf (&sb->s_type->i_mutex_key#31){+.+.}, at: inode_lock include/linux/fs.h:748 [inline]
 #1: 00000000cf7deaaf (&sb->s_type->i_mutex_key#31){+.+.}, at: fuse_open_common+0x1bc/0x2c0 fs/fuse/file.c:215

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

NMI backtrace for cpu 0
CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.207-syzkaller #0
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+0x1fc/0x2ef lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
 watchdog+0x991/0xe60 kernel/hung_task.c:287
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4692 Comm: systemd-journal Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_is_held+0x36/0x160 kernel/locking/lockdep.c:3721
Code: 65 4c 8b 3c 25 c0 df 01 00 41 56 49 89 fe 49 8d bf 80 08 00 00 41 55 48 89 fa 41 54 48 c1 ea 03 55 53 48 83 ec 08 0f b6 04 02 <89> 74 24 04 84 c0 74 08 3c 03 0f 8e ec 00 00 00 41 8b 87 80 08 00
RSP: 0018:ffff8880a0fefaa0 EFLAGS: 00000086
RAX: 0000000000000000 RBX: 0000000000000282 RCX: 0000000000000001
RDX: 1ffff110141fcdc0 RSI: 00000000ffffffff RDI: ffff8880a0fe6e00
RBP: ffffffff89f85f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880a0fe6580
R13: 000000000002b0c0 R14: ffffffff89f85f60 R15: ffff8880a0fe6580
FS:  00007fdfc9dbd8c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdfc7400018 CR3: 00000000a10c6000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_is_held_type+0x10d/0x210 kernel/locking/lockdep.c:3946
 lock_is_held include/linux/lockdep.h:344 [inline]
 schedule_debug kernel/sched/core.c:3337 [inline]
 __schedule+0xf7f/0x2040 kernel/sched/core.c:3439
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 schedule_hrtimeout_range_clock+0x33e/0x390 kernel/time/hrtimer.c:2002
 ep_poll+0xabb/0xcb0 fs/eventpoll.c:1817
 do_epoll_wait+0x1aa/0x200 fs/eventpoll.c:2190
 __do_sys_epoll_wait fs/eventpoll.c:2200 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2197 [inline]
 __x64_sys_epoll_wait+0x93/0xf0 fs/eventpoll.c:2197
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fdfc90862e3
Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 29 54 2b 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24
RSP: 002b:00007fff83a83cb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000555907e4f1e0 RCX: 00007fdfc90862e3
RDX: 0000000000000013 RSI: 00007fff83a83cc0 RDI: 0000000000000008
RBP: 00007fff83a83eb0 R08: 00007fff83b19000 R09: 00000137a1207cb1
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff83a83cc0
R13: 0000000000000001 R14: ffffffffffffffff R15: 0005ccde9099f601
----------------
Code disassembly (best guess):
   0:	65 4c 8b 3c 25 c0 df 	mov    %gs:0x1dfc0,%r15
   7:	01 00
   9:	41 56                	push   %r14
   b:	49 89 fe             	mov    %rdi,%r14
   e:	49 8d bf 80 08 00 00 	lea    0x880(%r15),%rdi
  15:	41 55                	push   %r13
  17:	48 89 fa             	mov    %rdi,%rdx
  1a:	41 54                	push   %r12
  1c:	48 c1 ea 03          	shr    $0x3,%rdx
  20:	55                   	push   %rbp
  21:	53                   	push   %rbx
  22:	48 83 ec 08          	sub    $0x8,%rsp
  26:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax
* 2a:	89 74 24 04          	mov    %esi,0x4(%rsp) <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e ec 00 00 00    	jle    0x126
  3a:	41                   	rex.B
  3b:	8b                   	.byte 0x8b
  3c:	87                   	.byte 0x87
  3d:	80 08 00             	orb    $0x0,(%rax)

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/09/26 04:39 linux-4.19.y 2950c9c5e0df 8cac236e .config console log report info ci2-linux-4-19 INFO: task hung in fuse_flush
* Struck through repros no longer work on HEAD.