------------[ cut here ]------------
WARNING: net/ipv4/ipmr.c:2302 at ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302, CPU#1: syz.5.229/6908
Modules linked in:
CPU: 1 UID: 0 PID: 6908 Comm: syz.5.229 Not tainted 6.16.0-rc2-next-20250620-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302
Code: df e9 63 f6 ff ff e8 2e 47 bf f7 48 8b 74 24 18 45 31 f6 31 ff ba 02 00 00 00 e8 1a 08 4c ff e9 45 f6 ff ff e8 10 47 bf f7 90 <0f> 0b 90 e9 94 f5 ff ff e8 02 47 bf f7 90 0f 0b 90 42 80 3c 2b 00
RSP: 0018:ffffc90000a08900 EFLAGS: 00010246
RAX: ffffffff8a0111d0 RBX: ffff88805df96500 RCX: ffff88801def3c00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000a08a10 R08: ffff88801def3c00 R09: 0000000000000004
R10: 0000000000000003 R11: ffffffff8a010620 R12: 0000000000000010
R13: dffffc0000000000 R14: ffff888020f2c200 R15: 0000000000000000
FS: 00007f25a155b6c0(0000) GS:ffff888125d26000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c81cff8 CR3: 000000007d35e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
igmp_send_report+0x89e/0xdb0 net/ipv4/igmp.c:799
igmp_timer_expire+0x204/0x510 net/ipv4/igmp.c:-1
call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x286/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_flush_all+0x7f7/0xc40 kernel/printk/printk.c:3227
Code: 48 21 c3 0f 85 e9 01 00 00 e8 15 1e 1f 00 48 8b 5c 24 20 4d 85 f6 75 07 e8 06 1e 1f 00 eb 06 e8 ff 1d 1f 00 fb 48 8b 44 24 28 <42> 80 3c 20 00 74 08 48 89 df e8 ca 48 83 00 48 8b 1b 48 8b 44 24
RSP: 0018:ffffc900037e7280 EFLAGS: 00000287
RAX: 1ffffffff1d3728b RBX: ffffffff8e9b9458 RCX: 0000000000080000
RDX: ffffc9001be01000 RSI: 0000000000002955 RDI: 0000000000002956
RBP: ffffc900037e73d0 R08: ffffffff8fa193f7 R09: 1ffffffff1f4327e
R10: dffffc0000000000 R11: fffffbfff1f4327f R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000200 R15: ffffffff8e9b9400
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0xc4/0x270 kernel/printk/printk.c:3325
vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450
_printk+0xcf/0x120 kernel/printk/printk.c:2475
datablob_parse+0x43e/0x550 security/keys/encrypted-keys/encrypted.c:196
encrypted_instantiate+0x209/0x1a90 security/keys/encrypted-keys/encrypted.c:834
__key_instantiate_and_link+0x12b/0x4d0 security/keys/key.c:446
__key_create_or_update+0x923/0xa30 security/keys/key.c:941
key_create_or_update+0x42/0x60 security/keys/key.c:1021
__do_sys_add_key security/keys/keyctl.c:134 [inline]
__se_sys_add_key+0x329/0x400 security/keys/keyctl.c:74
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f25a078e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f25a155b038 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 00007f25a09b5fa0 RCX: 00007f25a078e929
RDX: 0000200000000400 RSI: 00002000000000c0 RDI: 0000200000000040
RBP: 00007f25a0810b39 R08: fffffffffffffffb R09: 0000000000000000
R10: 000000000000007b R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f25a09b5fa0 R15: 00007ffd5ac7d5a8
----------------
Code disassembly (best guess):
0: 48 21 c3 and %rax,%rbx
3: 0f 85 e9 01 00 00 jne 0x1f2
9: e8 15 1e 1f 00 call 0x1f1e23
e: 48 8b 5c 24 20 mov 0x20(%rsp),%rbx
13: 4d 85 f6 test %r14,%r14
16: 75 07 jne 0x1f
18: e8 06 1e 1f 00 call 0x1f1e23
1d: eb 06 jmp 0x25
1f: e8 ff 1d 1f 00 call 0x1f1e23
24: fb sti
25: 48 8b 44 24 28 mov 0x28(%rsp),%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 48 89 df mov %rbx,%rdi
34: e8 ca 48 83 00 call 0x834903
39: 48 8b 1b mov (%rbx),%rbx
3c: 48 rex.W
3d: 8b .byte 0x8b
3e: 44 rex.R
3f: 24 .byte 0x24