RBP: 00007f0985f271d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffed7a0b04f R14: 00007f0985f27300 R15: 0000000000022000
------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x364/0x400, CPU#0: syz-executor.5/14583
Modules linked in:
CPU: 0 UID: 0 PID: 14583 Comm: syz-executor.5 Not tainted 6.18.0-rc3-next-20251031 #1 PREEMPT(voluntary)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:get_data+0x364/0x400
Code: e8 83 e0 07 83 c0 03 38 d0 0f 8c be fe ff ff 84 d2 0f 84 b6 fe ff ff 48 89 ef e8 17 b8 5b 00 e9 a9 fe ff ff e8 4d bb 1e 00 90 <0f> 0b 90 45 31 e4 e9 3b ff ff ff e8 3c bb 1e 00 90 0f 0b 90 45 31
RSP: 0018:ffff88806ce085d8 EFLAGS: 00010006
RAX: 0000000000010100 RBX: ffff88806ce086f0 RCX: ffffffff815559d6
RDX: ffff8880143b5280 RSI: ffffffff81555ba3 RDI: 0000000000000006
RBP: ffff88806ce086b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85d30790
R13: 00003fffffffffff R14: 0000000000000000 R15: 0000000000000000
FS: 00007f0985f27700(0000) GS:ffff8880e53ed000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0985f26f78 CR3: 000000000d241000 CR4: 0000000000350ef0
Call Trace:
_prb_read_valid+0x2f3/0x830
prb_read_valid+0x78/0xa0
printk_get_next_message+0x10b/0x570
console_flush_one_record+0x64f/0xb20
__console_flush_and_unlock+0xb1/0x1d0
wake_up_klogd_work_func+0x17c/0x1e0
irq_work_single+0x128/0x260
irq_work_run_list+0x91/0xc0
update_process_times+0x12f/0x210
tick_nohz_handler+0x414/0x6d0
__hrtimer_run_queues+0x60f/0xac0
hrtimer_interrupt+0x369/0x830
__sysvec_apic_timer_interrupt+0xbb/0x330
sysvec_apic_timer_interrupt+0x34/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:handle_softirqs+0x174/0x770
Code: c8 83 83 3c 0a 00 00 01 c7 44 24 20 0a 00 00 00 48 89 44 24 18 65 66 c7 05 ef 72 67 06 00 00 e8 52 c4 40 00 fb bb ff ff ff ff <48> c7 c5 c0 c0 c0 85 41 0f bc de 83 c3 01 0f 85 9b 00 00 00 e9 8d
RSP: 0018:ffff88806ce08f78 EFLAGS: 00000202
RAX: 00000000000001c2 RBX: 00000000ffffffff RCX: ffffffff817c80b6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813bbd4e
RBP: ffff88801024f138 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86648157 R11: ffff88806ce37018 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000200 R15: 0000000000000000
__irq_exit_rcu+0xc4/0x100
irq_exit_rcu+0x9/0x20
sysvec_call_function_single+0xa6/0xc0
asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:dump_stack_lvl+0x115/0x120
Code: fc ff ff 4c 89 e2 31 f6 31 ff e8 66 57 71 fc e8 81 50 9b fc 48 89 ee 31 ff e8 57 24 bb fc e8 f2 28 bb fc e8 9d 93 c3 fc fb 5b <5d> 41 5c e9 e3 28 bb fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff88801024f1e0 EFLAGS: 00000202
RAX: 00000000000001bf RBX: ffffffff8609f840 RCX: ffffffff817c80b6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84b8ee03
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86648157 R11: 0000000000000001 R12: ffffffff8551dc20
R13: ffffffff8609f850 R14: 0000000000000000 R15: 0000000000000000
should_fail_ex+0x4d7/0x5e0
_copy_from_user+0x30/0xd0
csum_and_copy_from_iter_full+0x1fb/0x1f30
ip_generic_getfrag+0x181/0x270
__ip_append_data+0x17ab/0x40d0
ip_make_skb+0x22b/0x2a0
udp_sendmsg+0x1647/0x22c0
inet_sendmsg+0x109/0x150
____sys_sendmsg+0x947/0xc20
___sys_sendmsg+0x10f/0x1b0
__sys_sendmmsg+0x1f5/0x420
__x64_sys_sendmmsg+0x9d/0x110
do_syscall_64+0xbf/0x390
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f09889b1b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0985f27188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f0988ac4f60 RCX: 00007f09889b1b19
RDX: 0000000000000001 RSI: 0000000020000640 RDI: 0000000000000003
RBP: 00007f0985f271d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffed7a0b04f R14: 00007f0985f27300 R15: 0000000000022000
irq event stamp: 451
hardirqs last enabled at (450): [] handle_softirqs+0x16e/0x770
hardirqs last disabled at (451): [] sysvec_apic_timer_interrupt+0xf/0x80
softirqs last enabled at (442): [] handle_softirqs+0x50c/0x770
softirqs last disabled at (449): [] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 14587 Comm: syz-executor.3 Tainted: G W 6.18.0-rc3-next-20251031 #1 PREEMPT(voluntary)
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xfa/0x120
should_fail_ex+0x4d7/0x5e0
_copy_from_user+0x30/0xd0
kstrtouint_from_user+0xbd/0x180
proc_fail_nth_write+0x7b/0x220
vfs_write+0x2b7/0x1150
ksys_write+0x121/0x240
do_syscall_64+0xbf/0x390
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f81df9035ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 cc fd ff ff 48
RSP: 002b:00007f81dcea5170 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f81df9035ff
RDX: 0000000000000001 RSI: 00007f81dcea51e0 RDI: 0000000000000005
RBP: 00007f81dcea51d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
R13: 00007fffcb40e14f R14: 00007f81dcea5300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 14604 Comm: syz-executor.5 Tainted: G W 6.18.0-rc3-next-20251031 #1 PREEMPT(voluntary)
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xfa/0x120
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
kmem_cache_alloc_node_noprof+0x87/0x6b0
__alloc_skb+0x2ab/0x370
__ip_append_data+0x319b/0x40d0
ip_make_skb+0x22b/0x2a0
udp_sendmsg+0x1647/0x22c0
inet_sendmsg+0x109/0x150
____sys_sendmsg+0x947/0xc20
___sys_sendmsg+0x10f/0x1b0
__sys_sendmmsg+0x1f5/0x420
__x64_sys_sendmmsg+0x9d/0x110
do_syscall_64+0xbf/0x390
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f09889b1b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0985f27188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f0988ac4f60 RCX: 00007f09889b1b19
RDX: 0000000000000001 RSI: 0000000020000640 RDI: 0000000000000003
RBP: 00007f0985f271d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffed7a0b04f R14: 00007f0985f27300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: c8 83 83 3c enterq $0x8383,$0x3c
4: 0a 00 or (%rax),%al
6: 00 01 add %al,(%rcx)
8: c7 44 24 20 0a 00 00 movl $0xa,0x20(%rsp)
f: 00
10: 48 89 44 24 18 mov %rax,0x18(%rsp)
15: 65 66 c7 05 ef 72 67 movw $0x0,%gs:0x66772ef(%rip) # 0x667730e
1c: 06 00 00
1f: e8 52 c4 40 00 callq 0x40c476
24: fb sti
25: bb ff ff ff ff mov $0xffffffff,%ebx
* 2a: 48 c7 c5 c0 c0 c0 85 mov $0xffffffff85c0c0c0,%rbp <-- trapping instruction
31: 41 0f bc de bsf %r14d,%ebx
35: 83 c3 01 add $0x1,%ebx
38: 0f 85 9b 00 00 00 jne 0xd9
3e: e9 .byte 0xe9
3f: 8d .byte 0x8d