syzbot


INFO: task hung in txBegin

Status: upstream: reported on 2023/01/31 18:37
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+d03191c2875beeef3352@syzkaller.appspotmail.com
First crash: 648d, last: 648d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in txBegin jfs C inconclusive 27 25d 137d 0/28 upstream: reported C repro on 2024/06/25 15:36
linux-6.1 INFO: task hung in txBegin 1 85d 85d 0/3 upstream: reported on 2024/08/17 05:46

Sample crash report:
INFO: task syz-executor.2:19271 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D25720 19271   8137 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
 io_schedule+0xb5/0x120 kernel/sched/core.c:5181
 TXN_SLEEP_DROP_LOCK fs/jfs/jfs_txnmgr.c:138 [inline]
 txBegin+0x41c/0x8c0 fs/jfs/jfs_txnmgr.c:382
 jfs_commit_inode+0x181/0x3d0 fs/jfs/inode.c:113
 jfs_fsync+0x125/0x210 fs/jfs/file.c:50
 vfs_fsync_range+0x13a/0x220 fs/sync.c:197
 generic_write_sync include/linux/fs.h:2750 [inline]
 generic_file_write_iter+0x4be/0x730 mm/filemap.c:3327
 call_write_iter include/linux/fs.h:1821 [inline]
 do_iter_readv_writev+0x668/0x790 fs/read_write.c:681
 do_iter_write+0x182/0x5d0 fs/read_write.c:960
 vfs_iter_write+0x70/0xa0 fs/read_write.c:973
 iter_file_splice_write+0x60d/0xbb0 fs/splice.c:750
 do_splice_from fs/splice.c:852 [inline]
 direct_splice_actor+0x115/0x160 fs/splice.c:1025
 splice_direct_to_actor+0x33f/0x8d0 fs/splice.c:980
 do_splice_direct+0x1a7/0x270 fs/splice.c:1068
 do_sendfile+0x550/0xc30 fs/read_write.c:1447
 __do_sys_sendfile64 fs/read_write.c:1502 [inline]
 __se_sys_sendfile64+0xc4/0x160 fs/read_write.c:1494
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f3065eb40c9
Code: Bad RIP value.
RSP: 002b:00007f305cfc3168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f3065fd41f0 RCX: 00007f3065eb40c9
RDX: 0000000020000240 RSI: 0000000000000009 RDI: 0000000000000009
RBP: 00007f3065f0fae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000007fff R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc789656af R14: 00007f305cfc3300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/1570:
 #0: 000000009bdb1b6e (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
1 lock held by systemd-journal/4693:
 #0: 00000000c37fc8c8 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline]
 #0: 00000000c37fc8c8 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by in:imklog/7799:
 #0: 0000000089468de7 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
1 lock held by syz-executor.4/8146:
3 locks held by kworker/u4:8/9507:
2 locks held by syz-executor.2/19271:
 #0: 000000001e2c059a (sb_writers#17){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline]
 #0: 000000001e2c059a (sb_writers#17){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446
 #1: 00000000a73ec3f1 (&sb->s_type->i_mutex_key#27){+.+.}, at: inode_lock include/linux/fs.h:748 [inline]
 #1: 00000000a73ec3f1 (&sb->s_type->i_mutex_key#27){+.+.}, at: jfs_fsync+0xa8/0x210 fs/jfs/file.c:41
2 locks held by syz-executor.5/21814:
 #0: 0000000056d02b64 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline]
 #0: 0000000056d02b64 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446
 #1: 000000003cec808b (&sb->s_type->i_mutex_key#10){++++}, at: inode_lock include/linux/fs.h:748 [inline]
 #1: 000000003cec808b (&sb->s_type->i_mutex_key#10){++++}, at: __generic_file_fsync+0xb0/0x1f0 fs/libfs.c:989
2 locks held by syz-executor.5/21815:
 #0: 0000000056d02b64 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline]
 #0: 0000000056d02b64 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446
 #1: 000000003cec808b (&sb->s_type->i_mutex_key#10){++++}, at: inode_lock include/linux/fs.h:748 [inline]
 #1: 000000003cec808b (&sb->s_type->i_mutex_key#10){++++}, at: __generic_file_fsync+0xb0/0x1f0 fs/libfs.c:989
2 locks held by syz-executor.5/21839:
2 locks held by syz-executor.0/21841:
 #0: 0000000056d02b64 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline]
 #0: 0000000056d02b64 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446
 #1: 0000000034727c8e (&sb->s_type->i_mutex_key#10){++++}, at: inode_lock include/linux/fs.h:748 [inline]
 #1: 0000000034727c8e (&sb->s_type->i_mutex_key#10){++++}, at: __generic_file_fsync+0xb0/0x1f0 fs/libfs.c:989
2 locks held by syz-executor.0/21842:
3 locks held by syz-executor.2/21860:
3 locks held by syz-executor.3/21865:
2 locks held by syz-executor.1/21867:
2 locks held by syz-executor.4/21868:
2 locks held by systemd-udevd/21871:
 #0: 000000001dae1280 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478
 #1: 00000000c37fc8c8 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline]
 #1: 00000000c37fc8c8 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455

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

NMI backtrace for cpu 1
CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 21860 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:gfp_zone include/linux/gfp.h:448 [inline]
RIP: 0010:prepare_alloc_pages mm/page_alloc.c:4328 [inline]
RIP: 0010:__alloc_pages_nodemask+0x105/0x2890 mm/page_alloc.c:4393
Code: 00 23 3d 1a 9b a7 09 48 89 cb b8 22 01 32 01 89 fe 89 bd 84 fe ff ff 83 e6 0f 8d 0c 36 d3 f8 b9 e8 e8 00 00 83 e0 03 0f a3 f1 <0f> 82 b9 04 00 00 89 85 24 ff ff ff 49 63 c3 48 8d 3c c5 40 dd 26
RSP: 0018:ffff88802c247510 EFLAGS: 00000206
RAX: 0000000000000003 RBX: 0000000000000000 RCX: 000000000000e8e8
RDX: dffffc0000000000 RSI: 000000000000000a RDI: 00000000006200ca
RBP: ffff88802c247728 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000000 R12: 00000000006200ca
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f98c4cb7700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4ebd3c9718 CR3: 000000009aa28000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 alloc_pages_vma+0xf2/0x780 mm/mempolicy.c:2161
 shmem_alloc_page+0x11c/0x1f0 mm/shmem.c:1494
 shmem_alloc_and_acct_page+0x15a/0x850 mm/shmem.c:1519
 shmem_getpage_gfp+0x4e9/0x37f0 mm/shmem.c:1797
 shmem_getpage mm/shmem.c:132 [inline]
 shmem_write_begin+0xff/0x1e0 mm/shmem.c:2446
 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3170
 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295
 generic_file_write_iter+0x3f8/0x730 mm/filemap.c:3323
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x51b/0x770 fs/read_write.c:487
 vfs_write+0x1f3/0x540 fs/read_write.c:549
 ksys_write+0x12b/0x2a0 fs/read_write.c:599
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f98c66f6e4f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 cc fd ff ff 48
RSP: 002b:00007f98c4cb6f10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f98c66f6e4f
RDX: 0000000001000000 RSI: 00007f98bc897000 RDI: 0000000000000003
RBP: 00007f98bc897000 R08: 0000000000000000 R09: 0000000000005dc6
R10: 0000000001000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f98c4cb6fdc R14: 00007f98c4cb6fe0 R15: 0000000020005ec2
jfs: Unrecognized mount option "@" or missing value
9pnet: Insufficient options for proto=fd

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/31 18:37 linux-4.19.y 3f8a27f9e27b b68fb8d6 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 INFO: task hung in txBegin
* Struck through repros no longer work on HEAD.