net_ratelimit: 16 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 INFO: task syz-executor.2:17434 blocked for more than 140 seconds. Not tainted 4.19.89-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28216 17434 7759 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline] _synchronize_rcu_expedited+0x6b6/0x7f0 kernel/rcu/tree_exp.h:667 synchronize_rcu_expedited kernel/rcu/tree_exp.h:795 [inline] synchronize_rcu_expedited+0x35/0xb0 kernel/rcu/tree_exp.h:784 synchronize_net+0x3b/0x60 net/core/dev.c:9084 packet_release+0xa20/0xc70 net/packet/af_packet.c:3038 __sock_release+0xce/0x2a0 net/socket.c:579 sock_close+0x1b/0x30 net/socket.c:1140 __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4144a1 Code: 00 00 48 8d 54 24 04 48 8d 7c 24 08 48 89 ee e8 c5 fc ff ff 48 89 ee 48 89 df e8 da 70 00 00 48 8d 54 24 04 48 8d 7c 24 08 48 <89> ee e8 a8 fc ff ff 48 89 ee 48 89 df e8 9d 73 00 00 8b 54 24 04 RSP: 002b:00007ffd8133d050 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 00000000004144a1 RDX: 0000000000000000 RSI: 00000000000008ca RDI: 0000000000000007 RBP: 0000000000000001 R08: 00000000edc708ca R09: 00000000edc708ce R10: 00007ffd8133d130 R11: 0000000000000293 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 0000000000761598 R15: 000000000075c1cc INFO: task syz-executor.4:17437 blocked for more than 140 seconds. Not tainted 4.19.89-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28216 17437 7767 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline] _synchronize_rcu_expedited+0x6b6/0x7f0 kernel/rcu/tree_exp.h:667 synchronize_rcu_expedited kernel/rcu/tree_exp.h:795 [inline] synchronize_rcu_expedited+0x35/0xb0 kernel/rcu/tree_exp.h:784 synchronize_net+0x3b/0x60 net/core/dev.c:9084 packet_release+0x776/0xc70 net/packet/af_packet.c:3038 __sock_release+0xce/0x2a0 net/socket.c:579 sock_close+0x1b/0x30 net/socket.c:1140 __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4144a1 Code: 00 00 48 8d 54 24 04 48 8d 7c 24 08 48 89 ee e8 c5 fc ff ff 48 89 ee 48 89 df e8 da 70 00 00 48 8d 54 24 04 48 8d 7c 24 08 48 <89> ee e8 a8 fc ff ff 48 89 ee 48 89 df e8 9d 73 00 00 8b 54 24 04 RSP: 002b:00007ffdc608cef0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004144a1 RDX: 0000001b31220000 RSI: 000000000000008c RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000010cfc08c R09: 0000000010cfc090 R10: 00007ffdc608cfd0 R11: 0000000000000293 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 00000000007608a0 R15: 000000000075bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1067: #0: 000000004029228a (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438 1 lock held by rsyslogd/7589: #0: 00000000a80953ab (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by getty/7710: #0: 00000000cda85c9f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000013adc5b7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7712: #0: 0000000079404c40 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000d079362f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7713: protocol 88fb is buggy, dev hsr_slave_0 #0: 0000000020e8d0a2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 protocol 88fb is buggy, dev hsr_slave_1 #1: 00000000fe59a7ee (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7714: #0: 00000000e98b5c79 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000000725540 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7715: #0: 00000000cc1a4da3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000e9e77e18 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7716: #0: 000000000f04a993 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000da47ddd8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7717: #0: 000000009bbadb38 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000062c18ff (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 1 lock held by syz-executor.2/17434: #0: 00000000dbb49b76 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline] #0: 00000000dbb49b76 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x89/0x2a0 net/socket.c:578 1 lock held by syz-executor.4/17437: #0: 00000000eac2b991 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline] #0: 00000000eac2b991 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x89/0x2a0 net/socket.c:578 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1067 Comm: khungtaskd Not tainted 4.19.89-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3669 Comm: udevd Not tainted 4.19.89-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_add include/linux/list.h:63 [inline] RIP: 0010:list_add_tail include/linux/list.h:93 [inline] RIP: 0010:ep_send_events_proc+0x89e/0xc10 fs/eventpoll.c:1696 Code: 60 ff ff ff e8 03 c0 ab ff 0f b6 b5 60 ff ff ff 40 84 f6 74 70 e8 b2 be ab ff 48 8b 85 68 ff ff ff 48 c1 e8 03 42 80 3c 20 00 <0f> 85 22 03 00 00 48 8b 85 48 ff ff ff 48 89 98 18 01 00 00 48 89 RSP: 0018:ffff888095e87b10 EFLAGS: 00000246 RAX: 1ffff11012b22e3b RBX: ffff888095893918 RCX: ffffffff81bf849d RDX: 0000000000000000 RSI: ffffffff81bf84ae RDI: 0000000000000001 RBP: ffff888095e87be8 R08: ffff888095e7a400 R09: ffffed1012bcd2c8 R10: ffffed1012bcd2c7 R11: ffff888095e6963f R12: dffffc0000000000 R13: ffff888095893920 R14: ffff888095e87dc0 R15: ffff8880959171d0 FS: 00007ff21d9217a0(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000095d94000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ep_scan_ready_list+0x305/0xb20 fs/eventpoll.c:708 ep_send_events fs/eventpoll.c:1713 [inline] ep_poll+0x3b4/0xd10 fs/eventpoll.c:1840 do_epoll_wait+0x1b3/0x200 fs/eventpoll.c:2198 __do_sys_epoll_wait fs/eventpoll.c:2208 [inline] __se_sys_epoll_wait fs/eventpoll.c:2205 [inline] __x64_sys_epoll_wait+0x97/0xf0 fs/eventpoll.c:2205 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff21d035943 Code: 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 83 3d b5 dc 2a 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 3b c4 00 00 48 89 04 24 RSP: 002b:00007ffc725469e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007ff21d035943 RDX: 0000000000000008 RSI: 00007ffc72546ae0 RDI: 000000000000000a RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000002178e60 R15: 0000000002129030