syzbot


INFO: task hung in nfsd_nl_version_get_doit

Status: upstream: reported on 2024/06/24 13:18
Subsystems: nfs
[Documentation on labels]
Reported-by: syzbot+41bc60511c2884783c27@syzkaller.appspotmail.com
First crash: 274d, last: 3d00h
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [nfs?] INFO: task hung in nfsd_nl_version_get_doit 0 (1) 2024/06/24 13:18

Sample crash report:
INFO: task syz.4.1103:10240 blocked for more than 143 seconds.
      Not tainted 6.14.0-rc2-syzkaller-00281-g496659003dac #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1103      state:D stack:26384 pid:10240 tgid:10239 ppid:5829   task_flags:0x400140 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0x18bc/0x4c40 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6856
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6913
 __mutex_lock_common kernel/locking/mutex.c:662 [inline]
 __mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730
 nfsd_nl_version_get_doit+0x181/0x790 fs/nfsd/nfsctl.c:1848
 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0xb1f/0xec0 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348
 netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1892
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:733
 ____sys_sendmsg+0x53a/0x860 net/socket.c:2573
 ___sys_sendmsg net/socket.c:2627 [inline]
 __sys_sendmsg+0x269/0x350 net/socket.c:2659
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f61ed98cde9
RSP: 002b:00007f61ee705038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f61edba5fa0 RCX: 00007f61ed98cde9
RDX: 0000000000040000 RSI: 0000400000000540 RDI: 000000000000000a
RBP: 00007f61eda0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f61edba5fa0 R15: 00007ffcae8ead18
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
3 locks held by kworker/u8:2/35:
2 locks held by getty/5582:
 #0: ffff888031ef70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
3 locks held by kworker/1:3/5876:
2 locks held by kworker/u8:11/6497:
 #0: ffff888146ec6148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
 #0: ffff888146ec6148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3317
 #1: ffffc9001bdffc60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
 #1: ffffc9001bdffc60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3317
4 locks held by udevd/7761:
 #0: ffff88807e548e80 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb4/0xd70 fs/seq_file.c:182
 #1: ffff88802a7f0888 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x53/0x3b0 fs/kernfs/file.c:154
 #2: ffff88807e78ce18 (kn->active#23){.+.+}-{0:0}, at: kernfs_seq_start+0x72/0x3b0 fs/kernfs/file.c:155
 #3: ffff88805b1f0190 (&dev->mutex){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:1035 [inline]
 #3: ffff88805b1f0190 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
2 locks held by syz.0.890/9243:
 #0: ffffffff8ff26090 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8ee051e8 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x12d/0x1a90 fs/nfsd/nfsctl.c:1922
2 locks held by syz.4.1103/10240:
 #0: ffffffff8ff26090 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8ee051e8 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_version_get_doit+0x181/0x790 fs/nfsd/nfsctl.c:1848

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc2-syzkaller-00281-g496659003dac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
 watchdog+0x1058/0x10a0 kernel/hung_task.c:399
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6497 Comm: kworker/u8:11 Not tainted 6.14.0-rc2-syzkaller-00281-g496659003dac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: iou_exit io_ring_exit_work
RIP: 0010:free_tail_page_prepare+0x1f/0x4b0 mm/page_alloc.c:991
Code: 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 48 89 f3 31 ed 49 bd 00 00 00 00 00 fc ff df eb 55 <48> 8d 7b 18 48 89 f8 48 c1 e8 03 42 80 3c 28 00 74 05 e8 aa a7 0e
RSP: 0018:ffffc9001bdff468 EFLAGS: 00000246
RAX: ffffea0001078000 RBX: ffffea000107b9c0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffea000107b9c0 RDI: ffffea0001078000
RBP: 0000000000000000 R08: ffffea000107b9b7 R09: 1ffffd400020f736
R10: dffffc0000000000 R11: fffff9400020f737 R12: 1ffffd400020f739
R13: dffffc0000000000 R14: ffffea0001078000 R15: ffffea000107b9c8
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f92d48c2cbd CR3: 000000005fa96000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 free_pages_prepare mm/page_alloc.c:1103 [inline]
 free_unref_folios+0x865/0x18a0 mm/page_alloc.c:2707
 folios_put_refs+0x76c/0x860 mm/swap.c:994
 release_pages+0x5c0/0x690 mm/swap.c:1034
 io_free_region+0xb7/0x260 io_uring/memmap.c:101
 io_rings_free io_uring/io_uring.c:2637 [inline]
 io_ring_ctx_free+0x338/0x530 io_uring/io_uring.c:2725
 io_ring_exit_work+0x813/0x8a0 io_uring/io_uring.c:2939
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3317
 worker_thread+0x870/0xd30 kernel/workqueue.c:3398
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Crashes (890):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/16 09:22 upstream 496659003dac 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nfsd_nl_version_get_doit
2025/02/11 20:17 upstream febbc555cf0f f2baddf5 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_version_get_doit
2025/02/09 05:48 upstream 9946eaf552b1 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_version_get_doit
2025/02/07 08:57 upstream bb066fe812d6 53657d1b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nfsd_nl_version_get_doit
2025/02/02 17:11 upstream 69e858e0b8b2 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nfsd_nl_version_get_doit
2025/01/18 15:07 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_version_get_doit
2025/01/11 15:25 upstream 77a903cd8e5a 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_version_get_doit
2025/01/09 07:51 upstream 0b7958fa05d5 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_version_get_doit
2025/01/06 13:45 upstream ab75170520d4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nfsd_nl_version_get_doit
2024/12/25 09:21 upstream 9b2ffa6148b1 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nfsd_nl_version_get_doit
2024/12/14 02:16 upstream f932fb9b4074 7cbfbb3a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nfsd_nl_version_get_doit
2024/11/30 10:49 upstream 2ba9f676d0a2 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nfsd_nl_version_get_doit
2024/11/23 22:06 upstream 228a1157fb9f 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_version_get_doit
2024/11/23 01:09 upstream 06afb0f36106 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_version_get_doit
2024/11/22 21:37 upstream 28eb75e178d3 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_version_get_doit
2024/11/21 11:39 upstream 8f7c8b88bda4 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_version_get_doit
2024/11/21 08:24 upstream 8f7c8b88bda4 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_version_get_doit
2024/11/16 19:06 upstream e8bdb3c8be08 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nfsd_nl_version_get_doit
2024/11/06 19:57 upstream 7758b206117d 3a465482 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nfsd_nl_version_get_doit
2024/11/06 15:59 upstream 2e1b3cc9d7f7 3a465482 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nfsd_nl_version_get_doit
2024/11/02 02:14 upstream 6c52d4da1c74 f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nfsd_nl_version_get_doit
2024/10/30 16:18 upstream c1e939a21eb1 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nfsd_nl_version_get_doit
2024/10/07 23:45 upstream 87d6aab2389e d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nfsd_nl_version_get_doit
2024/06/16 07:58 upstream 2ccbdf43d5e7 f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nfsd_nl_version_get_doit
2025/02/08 13:54 net cb827db50a88 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2025/02/04 00:41 net 235174b2bed8 a21a8419 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2025/01/13 02:34 net 47e55e4b410f 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2025/01/12 20:59 net 47e55e4b410f 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2025/01/12 18:37 net 47e55e4b410f 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2025/01/10 18:30 net 8c7a6efc017e 67d7ec0a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2025/01/10 08:28 net 8c7a6efc017e 67d7ec0a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2025/01/09 21:59 net d1bf27c4e176 40f46913 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2025/01/08 20:48 net db78475ba0d3 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2025/01/08 07:44 net db78475ba0d3 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2025/01/08 06:13 net db78475ba0d3 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/12/27 12:54 net b3a69c559899 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/12/27 11:44 net b3a69c559899 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/15 21:32 net ea301aec8bb7 f6ede3a3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/15 18:50 net ea301aec8bb7 f6ede3a3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/15 06:20 net cfaaa7d010d1 f6ede3a3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/14 22:59 net 5b366eae7193 77f3eeb7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/14 17:59 net 5b366eae7193 77f3eeb7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/13 18:02 net 73af53d82076 a8c99394 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/13 08:52 net 2b99b2532593 62026c85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/13 04:45 net 2b99b2532593 62026c85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/04 15:21 net 5ccdcdf186ae f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/04 02:31 net 3b557be89fc6 f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/03 23:45 net 3b557be89fc6 f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/03 13:13 net b2183187c5fd f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/03 05:37 net b2183187c5fd f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/11/02 23:12 net b2183187c5fd f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/10/24 13:48 net 9efc44fb2dba 15fa2979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/10/24 09:16 net 6e62807c7fbb 15fa2979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/10/24 05:18 net 6e62807c7fbb 15fa2979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/06/24 01:24 net 02ea312055da edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/12/26 13:20 net-next 9268abe611b0 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/12/05 00:47 net-next bb18265c3aba 29f61fce .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
2024/10/24 07:45 net-next 6d858708d465 15fa2979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in nfsd_nl_version_get_doit
* Struck through repros no longer work on HEAD.