syzbot


INFO: task hung in blkdev_fallocate

Status: upstream: reported C repro on 2023/03/12 23:16
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+d1600ddb4950c2beebf5@syzkaller.appspotmail.com
First crash: 461d, last: 29d
Fix bisection: failed (error log, bisect log)
  
Bug presence (1)
Date Name Commit Repro Result
2023/05/06 upstream (ToT) 2e1e1337881b C [report] INFO: task hung in blkdev_fallocate
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in blkdev_fallocate origin:upstream C error 17 26d 465d 0/3 upstream: reported C repro on 2023/03/08 05:38
upstream INFO: task hung in blkdev_fallocate block C error error 615 3d15h 894d 0/27 upstream: reported C repro on 2022/01/03 09:11
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2023/10/11 04:56 0m bisect fix linux-5.15.y error job log (0)
2023/06/28 01:43 1h06m bisect fix linux-5.15.y job log (0) log
2023/04/26 04:45 47m bisect fix linux-5.15.y job log (0) log

Sample crash report:
INFO: task syz-executor288:3552 blocked for more than 143 seconds.
      Not tainted 5.15.153-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor288 state:D stack:26744 pid: 3552 ppid:  3530 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
 __down_write_common kernel/locking/rwsem.c:1284 [inline]
 __down_write kernel/locking/rwsem.c:1293 [inline]
 down_write+0x164/0x170 kernel/locking/rwsem.c:1542
 filemap_invalidate_lock include/linux/fs.h:834 [inline]
 blkdev_fallocate+0x25e/0x4e0 block/fops.c:600
 vfs_fallocate+0x54a/0x6b0 fs/open.c:308
 ksys_fallocate fs/open.c:331 [inline]
 __do_sys_fallocate fs/open.c:339 [inline]
 __se_sys_fallocate fs/open.c:337 [inline]
 __x64_sys_fallocate+0xb9/0x100 fs/open.c:337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f13d2b85399
RSP: 002b:00007f13d2b46238 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f13d2c0f328 RCX: 00007f13d2b85399
RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004
RBP: 00007f13d2c0f320 R08: 00007f13d2b466c0 R09: 00007f13d2b466c0
R10: 7fffffffffffffff R11: 0000000000000246 R12: 6c756e2f7665642f
R13: 0000000000000000 R14: 00007ffc73a83ea0 R15: 00007ffc73a83f88
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c91f720 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
1 lock held by klogd/2952:
2 locks held by getty/3256:
 #0: ffff888022428098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc90001eae2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
1 lock held by syz-executor288/3543:
1 lock held by syz-executor288/3552:
 #0: ffff888145f2b878 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:834 [inline]
 #0: ffff888145f2b878 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_fallocate+0x25e/0x4e0 block/fops.c:600
1 lock held by syz-executor288/3554:
 #0: ffff888145f2b878 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:834 [inline]
 #0: ffff888145f2b878 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_fallocate+0x25e/0x4e0 block/fops.c:600
1 lock held by syz-executor288/3562:
 #0: ffff888145f2b878 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:834 [inline]
 #0: ffff888145f2b878 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_fallocate+0x25e/0x4e0 block/fops.c:600
1 lock held by syz-executor288/3564:
 #0: ffff888145f2b878 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:834 [inline]
 #0: ffff888145f2b878 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_fallocate+0x25e/0x4e0 block/fops.c:600

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.153-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
 watchdog+0xe72/0xeb0 kernel/hung_task.c:295
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2952 Comm: klogd Not tainted 5.15.153-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:lockdep_hardirqs_on_prepare+0x483/0x7a0 kernel/locking/lockdep.c:4280
Code: 48 c7 44 24 20 0e 36 e0 45 4a c7 04 3a 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 60 0f 85 c5 02 00 00 48 8d 65 d8 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 0f 0b 48 c7 c7 00 15 8b 8a e8 d5 b5
RSP: 0018:ffffc90002cf7340 EFLAGS: 00000046
RAX: f0f5557142cb3500 RBX: 0000000000000000 RCX: ffffffff913c7f03
RDX: dffffc0000000000 RSI: ffffffff8a8b27a0 RDI: ffffffff8ad88fc0
RBP: ffffc90002cf7360 R08: ffffffff8186b7c0 R09: fffffbfff1bc72a6
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807dc9c6b8
R13: 0000000000000001 R14: ffff88807dc9c668 R15: 1ffff9200059ee58
FS:  00007f145bb12380(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555de2738 CR3: 00000000221b1000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 trace_hardirqs_on+0x67/0x80 kernel/trace/trace_preemptirq.c:49
 free_unref_page+0x1c2/0x2d0 mm/page_alloc.c:3417
 free_slab mm/slub.c:2015 [inline]
 discard_slab mm/slub.c:2021 [inline]
 __unfreeze_partials+0x1b7/0x210 mm/slub.c:2507
 put_cpu_partial+0x132/0x1a0 mm/slub.c:2587
 do_slab_free mm/slub.c:3487 [inline]
 ___cache_free+0xe3/0x100 mm/slub.c:3506
 qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3220 [inline]
 kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256
 __alloc_skb+0xdd/0x590 net/core/skbuff.c:415
 alloc_skb include/linux/skbuff.h:1167 [inline]
 alloc_skb_with_frags+0xa3/0x780 net/core/skbuff.c:6133
 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2530
 unix_dgram_sendmsg+0x6fd/0x2090 net/unix/af_unix.c:1810
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x564/0x720 net/socket.c:2058
 __do_sys_sendto net/socket.c:2070 [inline]
 __se_sys_sendto net/socket.c:2066 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2066
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f145bc749b5
Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffd66c52c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f145bc749b5
RDX: 0000000000000046 RSI: 00005570b7b36cb0 RDI: 0000000000000003
RBP: 00005570b7b32910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007f145be02212 R14: 00007ffd66c52d68 R15: 0000000000000000
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.451 msecs

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/06 17:44 linux-5.15.y 9465fef4ae35 ca620dd8 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in blkdev_fallocate
2023/03/27 02:40 linux-5.15.y 115472395b0a fbf0499a .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in blkdev_fallocate
2024/05/17 06:01 linux-5.15.y 284087d4f7d5 c2e07261 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_fallocate
2024/04/26 04:46 linux-5.15.y c52b9710c83d 8bdc0f22 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_fallocate
2024/04/07 01:37 linux-5.15.y 9465fef4ae35 ca620dd8 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_fallocate
2023/05/07 22:47 linux-5.15.y 8a7f2a5c5aa1 90c93c40 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_fallocate
2023/05/27 23:44 linux-5.15.y 1fe619a7d252 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in blkdev_fallocate
2023/03/13 02:39 linux-5.15.y bbf9f29bac04 5205ef30 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_fallocate
2024/01/25 12:21 linux-5.15.y ddcaf4999061 1e153dc8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in blkdev_fallocate
2024/03/15 18:09 linux-5.15.y 574362648507 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_fallocate
2024/03/08 19:59 linux-5.15.y 574362648507 8e75c913 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_fallocate
2023/08/22 01:20 linux-5.15.y f6f7927ac664 6b415825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in blkdev_fallocate
2023/03/14 10:29 linux-5.15.y 2ddbd0f967b3 0d5c4377 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_fallocate
2023/03/13 10:43 linux-5.15.y 2ddbd0f967b3 5205ef30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_fallocate
2023/03/12 23:15 linux-5.15.y bbf9f29bac04 5205ef30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_fallocate
* Struck through repros no longer work on HEAD.