kernel msg: ebtables bug: please report to author: Valid hook without chain
kernel msg: ebtables bug: please report to author: Valid hook without chain
kernel msg: ebtables bug: please report to author: Valid hook without chain
kernel msg: ebtables bug: please report to author: Valid hook without chain
INFO: task syz-executor4:11208 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc7+ #278
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D24848 11208   5916 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
 schedule+0xfe/0x460 kernel/sched/core.c:3517
 __rwsem_down_write_failed_common+0xbb9/0x1670 kernel/locking/rwsem-xadd.c:566
 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595
 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117
 __down_write arch/x86/include/asm/rwsem.h:142 [inline]
 down_write+0xa5/0x130 kernel/locking/rwsem.c:72
 inode_lock include/linux/fs.h:738 [inline]
 vfs_setxattr+0x96/0x100 fs/xattr.c:218
 setxattr+0x2ea/0x450 fs/xattr.c:450
 path_setxattr+0x1e3/0x230 fs/xattr.c:469
 __do_sys_lsetxattr fs/xattr.c:491 [inline]
 __se_sys_lsetxattr fs/xattr.c:487 [inline]
 __x64_sys_lsetxattr+0xc1/0x150 fs/xattr.c:487
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457519
Code: Bad RIP value.
RSP: 002b:00007f5cf7931c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457519
RDX: 0000000020000880 RSI: 0000000020000600 RDI: 0000000020000500
RBP: 000000000072bfa0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007f5cf79326d4
R13: 00000000004c9748 R14: 00000000004d3930 R15: 00000000ffffffff
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 982 Comm: khungtaskd Not tainted 4.19.0-rc7+ #278
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+0x1c4/0x2b4 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed 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:144 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
 watchdog+0xb3e/0x1050 kernel/hung_task.c:265
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3194 Comm: udevd Not tainted 4.19.0-rc7+ #278
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:tk_clock_read kernel/time/timekeeping.c:170 [inline]
RIP: 0010:timekeeping_get_delta kernel/time/timekeeping.c:264 [inline]
RIP: 0010:timekeeping_get_ns kernel/time/timekeeping.c:371 [inline]
RIP: 0010:ktime_get_ts64+0x252/0x530 kernel/time/timekeeping.c:888
Code: 48 c1 e8 03 4c 01 e0 c6 00 00 48 8b 1d 6f 14 80 09 48 89 5d 90 c6 00 f8 48 89 d8 48 c1 e8 03 42 80 3c 20 00 0f 85 97 02 00 00 <48> 89 df 48 8b 03 e8 23 96 72 06 48 8b 15 4c 14 80 09 31 ff 48 2b
RSP: 0018:ffff8801c82ef888 EFLAGS: 00000246
RAX: 1ffffffff1263d90 RBX: ffffffff8931ec80 RCX: ffffffff816dd975
RDX: 0000000000000000 RSI: ffffffff816dd988 RDI: 0000000000000005
RBP: ffff8801c82ef990 R08: ffff8801c82e2140 R09: 0000000000000001
R10: ffffed00390186f0 R11: 0000000000000000 R12: dffffc0000000000
R13: 00000000000258c0 R14: ffffffff8931f280 R15: ffff8801c82efae8
FS:  00007f6999a2e7a0(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 00000001c87aa000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ep_set_mstimeout fs/eventpoll.c:1724 [inline]
 ep_poll+0x633/0x13d0 fs/eventpoll.c:1756
 do_epoll_wait+0x1b0/0x200 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+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f6999142943
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:00007fffb28e60f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007f6999142943
RDX: 0000000000000008 RSI: 00007fffb28e61f0 RDI: 000000000000000a
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 0000000000d153b0 R15: 0000000000d11250