RBP: 0000000000000006 R08: 0000000000011080 R09: ffffffffffffffff
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000008100000
R13: 0000000020000100 R14: 0000000000040000 R15: 0000000020013c00
------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x364/0x400, CPU#1: syz-executor.4/10912
Modules linked in:
CPU: 1 UID: 0 PID: 10912 Comm: syz-executor.4 Not tainted 6.18.0-rc4-next-20251105 #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 a7 01 5c 00 e9 a9 fe ff ff e8 0d f8 1e 00 90 <0f> 0b 90 45 31 e4 e9 3b ff ff ff e8 fc f7 1e 00 90 0f 0b 90 45 31
RSP: 0018:ffff88806cf086b8 EFLAGS: 00010046
RAX: 0000000000010000 RBX: ffff88806cf087d0 RCX: ffffffff8155a316
RDX: ffff88804afd1bc0 RSI: ffffffff8155a4e3 RDI: 0000000000000006
RBP: ffff88806cf08798 R08: 0000000000000cbc R09: 00000122ee460aa7
R10: 0000000000000000 R11: 00002aa082000046 R12: ffffffff85d2e590
R13: 00003fffffffffff R14: 0000000000000000 R15: 0000000000000000
FS: 00007f65caeed700(0000) GS:ffff8880e54a5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f65caeecf78 CR3: 000000001f1fd000 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+0x4ff/0x8c0
__hrtimer_run_queues+0x60f/0xab0
hrtimer_interrupt+0x369/0x830
__sysvec_apic_timer_interrupt+0xbb/0x330
sysvec_apic_timer_interrupt+0x6b/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:dump_stack_lvl+0x115/0x120
Code: fc ff ff 4c 89 e2 31 f6 31 ff e8 76 c3 6f fc e8 01 06 9a fc 48 89 ee 31 ff e8 97 16 ba fc e8 32 1b ba fc e8 1d 84 c2 fc fb 5b <5d> 41 5c e9 23 1b ba fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff888016a0fbf0 EFLAGS: 00000206
RAX: 00000000000000d7 RBX: ffffffff85f022c0 RCX: ffffffff817d04f6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84ba81c3
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86648957 R11: 0000000000000001 R12: ffffffff85520520
R13: ffffffff85f022d0 R14: 0000000000000000 R15: 0000000000000000
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
kmem_cache_alloc_noprof+0x80/0x690
security_inode_alloc+0x3e/0x130
inode_init_always_gfp+0xc9d/0xff0
alloc_inode+0x8d/0x250
new_inode+0x1e/0x160
__shmem_get_inode+0x17c/0xe80
__shmem_file_setup+0x107/0x370
alloc_file+0x2ae/0x590
__x64_sys_memfd_create+0x193/0x280
do_syscall_64+0xbf/0x430
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f65cd977b19
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:00007f65caeecf48 EFLAGS: 00000246 ORIG_RAX: 000000000000013f
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f65cd977b19
RDX: 0000000000022100 RSI: 0000000000000000 RDI: 00007f65cd9d10fb
RBP: 0000000000000006 R08: 0000000000011080 R09: ffffffffffffffff
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000008100000
R13: 0000000020000100 R14: 0000000000040000 R15: 0000000020013c00
irq event stamp: 216
hardirqs last enabled at (215): [] dump_stack_lvl+0x113/0x120
hardirqs last disabled at (216): [] sysvec_apic_timer_interrupt+0xf/0x80
softirqs last enabled at (210): [] handle_softirqs+0x50c/0x770
softirqs last disabled at (201): [] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
loop7: detected capacity change from 0 to 512
EXT4-fs (loop7): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
ext4 filesystem being mounted at /syzkaller-testdir565983694/syzkaller.SbH8jx/164/file0 supports timestamps until 2038-01-19 (0x7fffffff)
EXT4-fs (loop7): unmounting filesystem 00000000-0000-0000-0000-000000000000.
loop4: detected capacity change from 0 to 512
EXT4-fs error (device loop4): ext4_quota_enable:7131: comm syz-executor.4: Bad quota inum: 768, type: 0
EXT4-fs warning (device loop4): ext4_enable_quotas:7176: Failed to enable quota tracking (type=0, err=-117, ino=768). Please run e2fsck to fix.
loop5: detected capacity change from 0 to 512
EXT4-fs (loop4): mount failed
loop6: detected capacity change from 0 to 512
EXT4-fs (loop5): VFS: Can't find ext4 filesystem
loop7: detected capacity change from 0 to 512
EXT4-fs (loop7): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
ext4 filesystem being mounted at /syzkaller-testdir565983694/syzkaller.SbH8jx/165/file0 supports timestamps until 2038-01-19 (0x7fffffff)
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 10957 Comm: syz-executor.4 Tainted: G W 6.18.0-rc4-next-20251105 #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_lru_noprof+0x84/0x690
__d_alloc+0x31/0xa10
d_alloc_pseudo+0x1d/0xc0
alloc_file_pseudo+0xbe/0x220
__shmem_file_setup+0x1a7/0x370
alloc_file+0x2ae/0x590
__x64_sys_memfd_create+0x193/0x280
do_syscall_64+0xbf/0x430
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f65cd977b19
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:00007f65caeecf48 EFLAGS: 00000246 ORIG_RAX: 000000000000013f
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f65cd977b19
RDX: 0000000000022100 RSI: 0000000000000000 RDI: 00007f65cd9d10fb
RBP: 0000000000000006 R08: 0000000000011080 R09: ffffffffffffffff
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000008100000
R13: 0000000020000100 R14: 0000000000040000 R15: 0000000020013c00
loop6: detected capacity change from 0 to 96
loop5: detected capacity change from 0 to 512
EXT4-fs (loop5): VFS: Can't find ext4 filesystem
EXT4-fs (loop6): unsupported inode size: 0
EXT4-fs (loop6): blocksize: 2048
loop4: detected capacity change from 0 to 512
EXT4-fs error (device loop4): ext4_quota_enable:7131: comm syz-executor.4: Bad quota inum: 768, type: 0
EXT4-fs warning (device loop4): ext4_enable_quotas:7176: Failed to enable quota tracking (type=0, err=-117, ino=768). Please run e2fsck to fix.
EXT4-fs (loop4): mount failed
EXT4-fs (loop7): unmounting filesystem 00000000-0000-0000-0000-000000000000.
No source specified
loop7: detected capacity change from 0 to 512
EXT4-fs (loop7): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
ext4 filesystem being mounted at /syzkaller-testdir565983694/syzkaller.SbH8jx/166/file0 supports timestamps until 2038-01-19 (0x7fffffff)
EXT4-fs (loop7): unmounting filesystem 00000000-0000-0000-0000-000000000000.
----------------
Code disassembly (best guess), 2 bytes skipped:
0: ff 4c 89 e2 decl -0x1e(%rcx,%rcx,4)
4: 31 f6 xor %esi,%esi
6: 31 ff xor %edi,%edi
8: e8 76 c3 6f fc callq 0xfc6fc383
d: e8 01 06 9a fc callq 0xfc9a0613
12: 48 89 ee mov %rbp,%rsi
15: 31 ff xor %edi,%edi
17: e8 97 16 ba fc callq 0xfcba16b3
1c: e8 32 1b ba fc callq 0xfcba1b53
21: e8 1d 84 c2 fc callq 0xfcc28443
26: fb sti
27: 5b pop %rbx
* 28: 5d pop %rbp <-- trapping instruction
29: 41 5c pop %r12
2b: e9 23 1b ba fc jmpq 0xfcba1b53
30: 0f 1f 00 nopl (%rax)
33: 90 nop
34: 90 nop
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop