ci starts bisection 2023-02-07 06:13:24.747602664 +0000 UTC m=+49113.359458756 bisecting fixing commit since c7d102232649226a69dddd58a4942cf13cff4f7c building syzkaller on 6c236867ce33c0c16b102e02a08226d7eb9b2046 ensuring issue is reproducible on original commit c7d102232649226a69dddd58a4942cf13cff4f7c testing commit c7d102232649226a69dddd58a4942cf13cff4f7c gcc compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 354d895afd4f0dfa461eda34597bde4daf164e94df96dae1ff3c525bb5297cd7 run #0: crashed: INFO: task hung in synchronize_rcu run #1: crashed: INFO: task hung in synchronize_rcu run #2: crashed: INFO: task hung in synchronize_rcu run #3: crashed: INFO: task hung in synchronize_rcu run #4: crashed: INFO: task hung in synchronize_rcu run #5: crashed: INFO: task hung in synchronize_rcu run #6: crashed: INFO: task hung in synchronize_rcu run #7: crashed: INFO: task hung in synchronize_rcu run #8: crashed: INFO: task hung in synchronize_rcu run #9: crashed: INFO: task hung in synchronize_rcu run #10: crashed: INFO: task hung in __lru_add_drain_all run #11: crashed: INFO: task hung in __lru_add_drain_all run #12: crashed: INFO: task hung in synchronize_rcu run #13: crashed: INFO: task hung in synchronize_rcu run #14: crashed: INFO: task hung in __lru_add_drain_all run #15: crashed: INFO: task hung in synchronize_rcu run #16: crashed: INFO: task hung in synchronize_rcu run #17: crashed: INFO: task hung in __lru_add_drain_all run #18: crashed: BUG: workqueue lockup run #19: crashed: BUG: workqueue lockup testing current HEAD 811d581194f7412eda97acc03d17fc77824b561f testing commit 811d581194f7412eda97acc03d17fc77824b561f gcc compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 5e5bec8cb9f5c7a1c6281b18332d635436f1c73687c40479846a5ec37409d7fb run #0: basic kernel testing failed: BUG: program execution failed: executor NUM: exit status NUM run #1: crashed: INFO: task hung in synchronize_rcu run #2: crashed: INFO: task hung in synchronize_rcu run #3: crashed: INFO: task hung in synchronize_rcu run #4: crashed: INFO: task hung in synchronize_rcu run #5: crashed: INFO: task hung in __lru_add_drain_all run #6: crashed: INFO: task hung in synchronize_rcu run #7: crashed: INFO: task hung in synchronize_rcu run #8: crashed: INFO: task hung in synchronize_rcu run #9: crashed: INFO: task hung in __lru_add_drain_all revisions tested: 2, total time: 34m50.912648627s (build: 16m4.403225989s, test: 17m47.103515149s) the crash still happens on HEAD commit msg: net: USB: Fix wrong-direction WARNING in plusb.c crash: INFO: task hung in __lru_add_drain_all INFO: task khugepaged:34 blocked for more than 143 seconds. Not tainted 6.2.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:khugepaged state:D stack:23584 pid:34 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5293 [inline] __schedule+0x9f7/0x2890 kernel/sched/core.c:6606 schedule+0xde/0x1b0 kernel/sched/core.c:6682 schedule_timeout+0x1a3/0x260 kernel/time/timer.c:2143 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x1ce/0x5c0 kernel/sched/completion.c:106 __flush_work+0x4d7/0xa80 kernel/workqueue.c:3073 __lru_add_drain_all+0x387/0x680 mm/swap.c:931 khugepaged_do_scan mm/khugepaged.c:2407 [inline] khugepaged+0xfa/0x1190 mm/khugepaged.c:2476 kthread+0x298/0x340 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8b17df10 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8b17dc10 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/28: #0: ffffffff8b17ea60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x57/0x264 kernel/locking/lockdep.c:6494 1 lock held by khugepaged/34: #0: ffffffff8b26eb88 (lock#3){+.+.}-{3:3}, at: __lru_add_drain_all+0x57/0x680 mm/swap.c:886 2 locks held by getty/4731: #0: ffff88814a0c4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x23/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xb73/0x1040 drivers/tty/n_tty.c:2177 4 locks held by kworker/1:3/5191: 2 locks held by dhcpcd/15886: #0: ffff88801e36e130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1725 [inline] #0: ffff88801e36e130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x27/0xad0 net/packet/af_packet.c:3194 #1: ffffffff8b1896f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline] #1: ffffffff8b1896f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x5df/0x780 kernel/rcu/tree_exp.h:946 2 locks held by dhcpcd/15892: #0: ffff888078b02130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1725 [inline] #0: ffff888078b02130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x27/0xad0 net/packet/af_packet.c:3194 #1: ffffffff8b1896f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline] #1: ffffffff8b1896f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x24f/0x780 kernel/rcu/tree_exp.h:946 1 lock held by dhcpcd/15900: #0: ffff888027596130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1725 [inline] #0: ffff888027596130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x27/0xad0 net/packet/af_packet.c:3194 1 lock held by dhcpcd/15950: #0: ffff888024aca130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1725 [inline] #0: ffff888024aca130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x27/0xad0 net/packet/af_packet.c:3194 1 lock held by dhcpcd/15951: #0: ffff888026c88130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1725 [inline] #0: ffff888026c88130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x27/0xad0 net/packet/af_packet.c:3194 1 lock held by dhcpcd/15952: #0: ffff8880254c6130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1725 [inline] #0: ffff8880254c6130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x27/0xad0 net/packet/af_packet.c:3194 1 lock held by dhcpcd/15953: #0: ffff888021772130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1725 [inline] #0: ffff888021772130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x27/0xad0 net/packet/af_packet.c:3194 5 locks held by syz-executor.0/15955: #0: ffff8880165c0460 (sb_writers#11){.+.+}-{0:0}, at: ksys_write+0xf2/0x1c0 fs/read_write.c:637 #1: ffff888043671c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x218/0x530 fs/kernfs/file.c:325 #2: ffff888027049da0 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x23c/0x530 fs/kernfs/file.c:326 #3: ffffffff8b02d330 (cpu_hotplug_lock){++++}-{0:0}, at: cpuset_write_u64+0x43/0x250 kernel/cgroup/cpuset.c:2627 #4: ffffffff8b1d0c10 (&cpuset_rwsem){++++}-{0:0}, at: cpuset_write_u64+0x4f/0x250 kernel/cgroup/cpuset.c:2628 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x5b/0x81 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x18/0x106 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x259/0x2d0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0x8c8/0xc60 kernel/hung_task.c:377 kthread+0x298/0x340 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5191 Comm: kworker/1:3 Not tainted 6.2.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Workqueue: events ipvlan_process_multicast RIP: 0010:lock_is_held_type+0xef/0x140 kernel/locking/lockdep.c:5713 Code: 45 31 ed 44 39 f0 41 0f 94 c5 48 c7 c7 20 4e 0b 89 e8 65 10 00 00 b8 ff ff ff ff 65 0f c1 05 30 95 30 77 83 f8 01 75 29 9c 58 c4 02 75 3d 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 44 89 RSP: 0018:ffffc900001e0640 EFLAGS: 00000046 RAX: 0000000000000046 RBX: 0000000000000002 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff890b4e20 RDI: ffffffff896386a0 RBP: ffffffff8b17ea60 R08: 0000000000000001 R09: ffffc900001e0850 R10: ffff88801ee9fc00 R11: ffff88805e4b6dc0 R12: ffff88801e7b3980 R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88801e7b43c8 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fef0a3e5310 CR3: 000000000ae8e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __find_rr_leaf+0x23c/0xa40 net/ipv6/route.c:794 find_rr_leaf net/ipv6/route.c:850 [inline] rt6_select net/ipv6/route.c:894 [inline] fib6_table_lookup+0x4de/0x810 net/ipv6/route.c:2182 ip6_pol_route+0x181/0xdd0 net/ipv6/route.c:2218 pol_lookup_func include/net/ip6_fib.h:582 [inline] fib6_rule_lookup+0x100/0x660 net/ipv6/fib6_rules.c:116 ip6_route_input_lookup net/ipv6/route.c:2287 [inline] ip6_route_input+0x54b/0x9f0 net/ipv6/route.c:2583 ip6_rcv_finish net/ipv6/ip6_input.c:77 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] NF_HOOK include/linux/netfilter.h:296 [inline] ipv6_rcv+0x180/0x2e0 net/ipv6/ip6_input.c:309 __netif_receive_skb_one_core+0x104/0x180 net/core/dev.c:5482 process_backlog+0x326/0x730 net/core/dev.c:5924 __napi_poll+0x9e/0x5c0 net/core/dev.c:6485 napi_poll net/core/dev.c:6552 [inline] net_rx_action+0x8c8/0xcc0 net/core/dev.c:6663 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 do_softirq.part.0+0xde/0x130 kernel/softirq.c:472 do_softirq kernel/softirq.c:464 [inline] __local_bh_enable_ip+0x106/0x130 kernel/softirq.c:396 local_bh_enable include/linux/bottom_half.h:33 [inline] ipvlan_process_multicast+0x768/0xcb0 drivers/net/ipvlan/ipvlan_core.c:279 process_one_work+0x8ba/0x14c0 kernel/workqueue.c:2289 worker_thread+0x59c/0xec0 kernel/workqueue.c:2436 kthread+0x298/0x340 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308