syzbot


INFO: task hung in rtnl_lock

Status: auto-obsoleted due to no activity on 2023/11/17 15:29
Reported-by: syzbot+44c571376737f205ff22@syzkaller.appspotmail.com
First crash: 441d, last: 316d
Similar bugs (10)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in rtnl_lock 41 1598d 1698d 0/1 auto-closed as invalid on 2020/06/04 06:12
upstream INFO: task hung in rtnl_lock (2) net 1 844d 844d 0/27 auto-closed as invalid on 2022/05/28 17:21
linux-5.15 INFO: task hung in rtnl_lock (2) 1 163d 163d 0/3 auto-obsoleted due to no activity on 2024/04/18 21:58
linux-4.14 INFO: task hung in rtnl_lock 12 1588d 1699d 0/1 auto-closed as invalid on 2020/06/13 20:56
android-49 INFO: task hung in rtnl_lock 7 1661d 1700d 0/3 auto-closed as invalid on 2020/04/01 22:32
linux-6.1 INFO: task hung in rtnl_lock 7 319d 442d 0/3 auto-obsoleted due to no activity on 2023/11/14 10:24
linux-6.1 INFO: task hung in rtnl_lock (2) origin:lts-only C inconclusive 221 3h02m 192d 0/3 upstream: reported C repro on 2023/12/11 07:58
upstream INFO: task hung in rtnl_lock (3) net C 128 91d 443d 26/27 fixed on 2024/03/26 17:39
linux-5.15 INFO: task hung in rtnl_lock (3) origin:upstream C 227 2h57m 31d 0/3 upstream: reported C repro on 2024/05/20 16:41
upstream INFO: task hung in rtnl_lock net 118 1499d 1445d 0/27 auto-closed as invalid on 2020/09/10 12:52

Sample crash report:
INFO: task kworker/0:0:7 blocked for more than 143 seconds.
      Not tainted 5.15.125-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0     state:D stack:    0 pid:    7 ppid:     2 flags:0x00000008
Workqueue: events switchdev_deferred_process_work
Call trace:
 __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0xf10/0x1e38 kernel/sched/core.c:6372
 schedule+0x11c/0x1c8 kernel/sched/core.c:6455
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6514
 __mutex_lock_common+0xba0/0x2154 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72
 switchdev_deferred_process_work+0x14/0x28 net/switchdev/switchdev.c:74
 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310
 worker_thread+0x910/0x1034 kernel/workqueue.c:2457
 kthread+0x37c/0x45c kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
INFO: task dhcpcd:3638 blocked for more than 143 seconds.
      Not tainted 5.15.125-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:    0 pid: 3638 ppid:  3637 flags:0x0000000c
Call trace:
 __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0xf10/0x1e38 kernel/sched/core.c:6372
 schedule+0x11c/0x1c8 kernel/sched/core.c:6455
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6514
 __mutex_lock_common+0xba0/0x2154 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
 netlink_dump+0xbc/0xa88 net/netlink/af_netlink.c:2227
 __netlink_dump_start+0x488/0x6ec net/netlink/af_netlink.c:2384
 netlink_dump_start include/linux/netlink.h:258 [inline]
 rtnetlink_rcv_msg+0x980/0xdac net/core/rtnetlink.c:5562
 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2505
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:5617
 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
 netlink_unicast+0x664/0x938 net/netlink/af_netlink.c:1356
 netlink_sendmsg+0x844/0xb38 net/netlink/af_netlink.c:1924
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2039
 __do_sys_sendto net/socket.c:2051 [inline]
 __se_sys_sendto net/socket.c:2047 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2047
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
INFO: task kworker/1:0:1302 blocked for more than 143 seconds.
      Not tainted 5.15.125-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0     state:D stack:    0 pid: 1302 ppid:     2 flags:0x00000008
Workqueue: events linkwatch_event
Call trace:
 __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0xf10/0x1e38 kernel/sched/core.c:6372
 schedule+0x11c/0x1c8 kernel/sched/core.c:6455
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6514
 __mutex_lock_common+0xba0/0x2154 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72
 linkwatch_event+0x14/0x68 net/core/link_watch.c:251
 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310
 worker_thread+0x910/0x1034 kernel/workqueue.c:2457
 kthread+0x37c/0x45c kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
INFO: task syz-executor.4:8851 blocked for more than 143 seconds.
      Not tainted 5.15.125-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:    0 pid: 8851 ppid:     1 flags:0x00000005
Call trace:
 __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0xf10/0x1e38 kernel/sched/core.c:6372
 schedule+0x11c/0x1c8 kernel/sched/core.c:6455
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6514
 __mutex_lock_common+0xba0/0x2154 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0xa2c/0xdac net/core/rtnetlink.c:5596
 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2505
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:5617
 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
 netlink_unicast+0x664/0x938 net/netlink/af_netlink.c:1356
 netlink_sendmsg+0x844/0xb38 net/netlink/af_netlink.c:1924
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2039
 __do_sys_sendto net/socket.c:2051 [inline]
 __se_sys_sendto net/socket.c:2047 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2047
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Showing all locks held in the system:
3 locks held by kworker/0:0/7:
 #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283
 #1: ffff8000188e7c00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285
 #2: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72
1 lock held by khungtaskd/27:
 #0: ffff800014ad19a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:268
2 locks held by kworker/u4:3/153:
1 lock held by dhcpcd/3638:
 #0: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: netlink_dump+0xbc/0xa88 net/netlink/af_netlink.c:2227
2 locks held by getty/3727:
 #0: ffff0000d22eb098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
 #1: ffff80001a22b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1204 drivers/tty/n_tty.c:2158
3 locks held by kworker/0:12/6269:
 #0: ffff0000d1b45538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283
 #1: ffff800020a07c00 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285
 #2: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72
3 locks held by kworker/1:0/1302:
 #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283
 #1: ffff800020a37c00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285
 #2: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72
5 locks held by kworker/u4:0/1362:
 #0: ffff0000c03e4138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283
 #1: ffff80001f2d7c00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285
 #2: ffff8000169dbb10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf4/0x9bc net/core/net_namespace.c:558
 #3: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72
 #4: ffff800014ad5f28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #4: ffff800014ad5f28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x320/0x660 kernel/rcu/tree_exp.h:842
2 locks held by kworker/0:2/5454:
 #0: ffff0000c0021d38 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283
 #1: ffff800021d47c00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285
1 lock held by syz-executor.4/8851:
 #0: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac net/core/rtnetlink.c:5596
1 lock held by syz-executor.4/8907:
 #0: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac net/core/rtnetlink.c:5596
1 lock held by syz-executor.4/8914:
 #0: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac net/core/rtnetlink.c:5596

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


Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/08/09 15:28 linux-5.15.y c275eaaaa342 8ad1a287 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in rtnl_lock
2023/04/21 20:38 linux-5.15.y 3299fb36854f 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in rtnl_lock
2023/04/20 21:19 linux-5.15.y 3299fb36854f a219f34e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in rtnl_lock
2023/04/06 20:10 linux-5.15.y d86dfc4d95cd 08707520 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in rtnl_lock
* Struck through repros no longer work on HEAD.