BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1372 Comm: syz-executor Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e2fc1f80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881d2db31c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffa180
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d2db31c0
FS: 000055559306a500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e351a000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000004
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
call_timer_fn+0x3c/0x380 kernel/time/timer.c:1448
expire_timers kernel/time/timer.c:1493 [inline]
__run_timers+0x81d/0xb60 kernel/time/timer.c:1817
run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830
__do_softirq+0x236/0x660 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x197/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:539 [inline]
smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
RIP: 0010:console_unlock+0x9ea/0xe80 kernel/printk/printk.c:2527
Code: 64 56 86 e8 48 73 e1 02 f6 c3 01 48 8b 5c 24 28 0f 85 61 04 00 00 e8 55 f9 15 00 e8 80 5a 00 00 48 89 5c 24 70 ff 74 24 70 9d d0 f7 ff ff e8 3c f9 15 00 48 c7 05 d1 d7 0c 05 00 00 00 00 e9
RSP: 0018:ffff8881dc5f67a0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffffffff8149e019 RBX: 0000000000000293 RCX: ffff8881e2fc1f80
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: ffff8881dc5f6950 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103b8bece4 R11: 1ffff1103b8bece4 R12: 0000000000000000
R13: ffffffff85eefb30 R14: ffffffff8267bbc0 R15: dffffc0000000000
vprintk_emit+0x1be/0x380 kernel/printk/printk.c:2032
vprintk_default+0x28/0x30 kernel/printk/printk.c:2059
vprintk_func+0x19a/0x1e0 kernel/printk/printk_safe.c:393
printk+0xcc/0x110 kernel/printk/printk.c:2092
br_set_state+0x123/0x190 net/bridge/br_stp.c:45
new_nbp+0x4b9/0x640 net/bridge/br_if.c:431
br_add_if+0x291/0x10a0 net/bridge/br_if.c:595
br_add_slave+0x2c/0x40 net/bridge/br_device.c:375
do_set_master net/core/rtnetlink.c:2413 [inline]
do_setlink+0xd3e/0x39e0 net/core/rtnetlink.c:2549
__rtnl_newlink net/core/rtnetlink.c:3188 [inline]
rtnl_newlink+0x1136/0x15f0 net/core/rtnetlink.c:3314
rtnetlink_rcv_msg+0xa23/0xbe0 net/core/rtnetlink.c:5290
netlink_rcv_skb+0x1e6/0x430 net/netlink/af_netlink.c:2467
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5308
netlink_unicast_kernel net/netlink/af_netlink.c:1306 [inline]
netlink_unicast+0x88b/0xa40 net/netlink/af_netlink.c:1332
netlink_sendmsg+0x88d/0xb30 net/netlink/af_netlink.c:1900
sock_sendmsg_nosec net/socket.c:638 [inline]
__sock_sendmsg net/socket.c:650 [inline]
__sys_sendto+0x414/0x570 net/socket.c:1961
__do_sys_sendto net/socket.c:1973 [inline]
__se_sys_sendto net/socket.c:1969 [inline]
__x64_sys_sendto+0xe5/0x100 net/socket.c:1969
do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fd94b14c7a3
Code: 64 89 02 48 c7 c0 ff ff ff ff eb b7 66 2e 0f 1f 84 00 00 00 00 00 90 80 3d a1 3d 1f 00 00 41 89 ca 74 14 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 75 c3 0f 1f 40 00 55 48 83 ec 30 44 89 4c 24
RSP: 002b:00007ffd1b47eb58 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fd94bea0620 RCX: 00007fd94b14c7a3
RDX: 0000000000000028 RSI: 00007fd94bea0670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffd1b47eb74 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fd94bea0670 R15: 0000000000000000
Modules linked in:
CR2: 0000000000000000
---[ end trace d71bf400ec8d1e11 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e2fc1f80
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881d2db31c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffa180
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d2db31c0
FS: 000055559306a500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e351a000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000004
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 64 56 fs push %rsi
2: 86 e8 xchg %ch,%al
4: 48 73 e1 rex.W jae 0xffffffe8
7: 02 f6 add %dh,%dh
9: c3 ret
a: 01 48 8b add %ecx,-0x75(%rax)
d: 5c pop %rsp
e: 24 28 and $0x28,%al
10: 0f 85 61 04 00 00 jne 0x477
16: e8 55 f9 15 00 call 0x15f970
1b: e8 80 5a 00 00 call 0x5aa0
20: 48 89 5c 24 70 mov %rbx,0x70(%rsp)
25: ff 74 24 70 push 0x70(%rsp)
29: 9d popf
* 2a: e9 d0 f7 ff ff jmp 0xfffff7ff <-- trapping instruction
2f: e8 3c f9 15 00 call 0x15f970
34: 48 c7 05 d1 d7 0c 05 movq $0x0,0x50cd7d1(%rip) # 0x50cd810
3b: 00 00 00 00
3f: e9 .byte 0xe9