INFO: task syz-executor.5:11515 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.5 D28248 11515 2725 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 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1016 [inline] __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078 start_sync_thread+0x109/0x24a0 net/netfilter/ipvs/ip_vs_sync.c:1775 do_ip_vs_set_ctl+0x34b/0xec0 net/netfilter/ipvs/ip_vs_ctl.c:2380 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x6f/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt net/ipv4/ip_sockglue.c:1258 [inline] ip_setsockopt+0xd8/0xf0 net/ipv4/ip_sockglue.c:1238 raw_setsockopt+0xd8/0x100 net/ipv4/raw.c:861 __sys_setsockopt+0x14d/0x240 net/socket.c:2013 __do_sys_setsockopt net/socket.c:2024 [inline] __se_sys_setsockopt net/socket.c:2021 [inline] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2021 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fee2c7880d9 Code: Bad RIP value. RSP: 002b:00007fee2acfa168 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fee2c8a7f80 RCX: 00007fee2c7880d9 RDX: 000000000000048b RSI: 0000000000000000 RDI: 0000000000000009 RBP: 00007fee2c7e3ae9 R08: 0000000000000018 R09: 0000000000000000 R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc6c1a1a1f R14: 00007fee2acfa300 R15: 0000000000022000 INFO: task syz-executor.1:11514 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.1 D28248 11514 2665 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 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1016 [inline] __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078 start_sync_thread+0x109/0x24a0 net/netfilter/ipvs/ip_vs_sync.c:1775 do_ip_vs_set_ctl+0x34b/0xec0 net/netfilter/ipvs/ip_vs_ctl.c:2380 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x6f/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt net/ipv4/ip_sockglue.c:1258 [inline] ip_setsockopt+0xd8/0xf0 net/ipv4/ip_sockglue.c:1238 raw_setsockopt+0xd8/0x100 net/ipv4/raw.c:861 __sys_setsockopt+0x14d/0x240 net/socket.c:2013 __do_sys_setsockopt net/socket.c:2024 [inline] __se_sys_setsockopt net/socket.c:2021 [inline] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2021 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fcea2fbb0d9 Code: Bad RIP value. RSP: 002b:00007fcea152d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fcea30daf80 RCX: 00007fcea2fbb0d9 RDX: 000000000000048b RSI: 0000000000000000 RDI: 0000000000000009 RBP: 00007fcea3016ae9 R08: 0000000000000018 R09: 0000000000000000 R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd91cd21ef R14: 00007fcea152d300 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by systemd/1: 3 locks held by kworker/0:0/5: #0: 00000000dd32f371 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000b0a07730 (deferred_process_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 0000000060a21350 (rtnl_mutex){+.+.}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:150 3 locks held by kworker/u4:1/23: 1 lock held by khungtaskd/1570: #0: 000000002115531e (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by systemd-journal/4687: 4 locks held by systemd-udevd/4707: 1 lock held by in:imklog/7779: #0: 000000007d873705 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 4 locks held by syz-fuzzer/8129: 2 locks held by kworker/u4:6/9374: 3 locks held by kworker/u4:8/23663: 3 locks held by kworker/1:1/23821: 3 locks held by kworker/1:5/31434: #0: 0000000074b7f63b ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000033a93b6 ((addr_chk_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 0000000060a21350 (rtnl_mutex){+.+.}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4476 5 locks held by kworker/0:5/31520: 4 locks held by syz-executor.0/2688: 5 locks held by kworker/u4:10/6864: 3 locks held by kworker/u4:11/8254: 3 locks held by kworker/u4:12/9603: 2 locks held by kworker/u4:13/9732: 1 lock held by syz-executor.3/9799: #0: 0000000060a21350 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 0000000060a21350 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.2/9837: #0: 0000000060a21350 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 0000000060a21350 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 2 locks held by syz-executor.4/11502: 1 lock held by syz-executor.5/11515: #0: 0000000060a21350 (rtnl_mutex){+.+.}, at: start_sync_thread+0x109/0x24a0 net/netfilter/ipvs/ip_vs_sync.c:1775 1 lock held by syz-executor.1/11514: #0: 0000000060a21350 (rtnl_mutex){+.+.}, at: start_sync_thread+0x109/0x24a0 net/netfilter/ipvs/ip_vs_sync.c:1775 1 lock held by kworker/u4:11/11534: 2 locks held by kworker/u4:13/11535: ============================================= 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 10/26/2022 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: 31520 Comm: kworker/0:5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events_power_efficient fb_flashcursor RIP: 0010:debug_lockdep_rcu_enabled kernel/rcu/update.c:254 [inline] RIP: 0010:debug_lockdep_rcu_enabled kernel/rcu/update.c:251 [inline] RIP: 0010:rcu_read_lock_bh_held+0x9e/0x160 kernel/rcu/update.c:308 Code: 84 9b 00 00 00 65 48 8b 1c 25 c0 df 01 00 48 8d bb 84 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 8e 00 00 00 8b RSP: 0018:ffff8880ba007ae0 EFLAGS: 00000a07 RAX: dffffc0000000000 RBX: ffff8880a5848280 RCX: 1ffffffff148be2c RDX: 0000000000000000 RSI: ffffffff86768946 RDI: ffff8880a5848b04 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 000000005f2d98df R12: ffff8880720d1a80 R13: 0000000000000048 R14: 0000000000000000 R15: ffff888031781640 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c00d0c3010 CR3: 0000000097a00000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 00000000b8fecd19 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __dev_queue_xmit+0x1f3b/0x2e00 net/core/dev.c:3803 can_send+0x4be/0xa00 net/can/af_can.c:297 bcm_can_tx+0x565/0x800 net/can/bcm.c:300 bcm_tx_timeout_tsklet+0x1f0/0x3a0 net/can/bcm.c:414 tasklet_action_common.constprop.0+0x265/0x360 kernel/softirq.c:522 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:slow_down_io arch/x86/include/asm/paravirt.h:268 [inline] RIP: 0010:outb_p arch/x86/include/asm/io.h:333 [inline] RIP: 0010:vga_io_w include/video/vga.h:209 [inline] RIP: 0010:vga_io_rgfx include/video/vga.h:388 [inline] RIP: 0010:setcolor drivers/video/fbdev/vga16fb.c:170 [inline] RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1164 [inline] RIP: 0010:vga16fb_imageblit+0x93e/0x2260 drivers/video/fbdev/vga16fb.c:1260 Code: fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 09 3c 03 7f 05 e8 51 e6 f9 fd 48 8b 04 24 ba ce 03 00 00 8b 58 10 31 c0 ee <48> c7 c2 10 82 f1 89 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 RSP: 0018:ffff88806ebbfa50 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000007 RCX: ffffffff839e79cc RDX: 00000000000003ce RSI: ffffffff839e79da RDI: ffff88823a551810 RBP: ffff88823a551804 R08: ffff8880b078963f R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880b0791b48 R13: ffff8880b0789630 R14: ffff88823a551820 R15: 0000000000000001 soft_cursor+0x514/0xa30 drivers/video/fbdev/core/softcursor.c:74 bit_cursor+0x1126/0x1740 drivers/video/fbdev/core/bitblit.c:377 fb_flashcursor+0x38c/0x430 drivers/video/fbdev/core/fbcon.c:379 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415