RBP: 00007f915d86f040 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f915d86f000 R15: 0000000020000380
------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x364/0x400, CPU#0: syz-executor.2/7728
Modules linked in:
CPU: 0 UID: 0 PID: 7728 Comm: syz-executor.2 Not tainted 6.18.0-rc2-next-20251024 #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 37 89 5b 00 e9 a9 fe ff ff e8 fd b6 1e 00 90 <0f> 0b 90 45 31 e4 e9 3b ff ff ff e8 ec b6 1e 00 90 0f 0b 90 45 31
RSP: 0018:ffff88806ce08720 EFLAGS: 00010046
RAX: 0000000000010000 RBX: ffff88806ce08838 RCX: ffffffff81555256
RDX: ffff88801d08d280 RSI: ffffffff81555423 RDI: 0000000000000006
RBP: ffff88806ce08800 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85d30690
R13: 00003fffffffffff R14: 0000000000000000 R15: 0000000000000000
FS: 00007f915d86f700(0000) GS:ffff8880e53f4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560eb9bd07d0 CR3: 0000000047d0e000 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+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 86 97 72 fc e8 81 8e 9c fc 48 89 ee 31 ff e8 87 58 bc fc e8 22 5d bc fc e8 cd b9 c4 fc fb 5b <5d> 41 5c e9 13 5d bc fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff88804e6bfa00 EFLAGS: 00000206
RAX: 000000000000018b RBX: ffffffff85f036e0 RCX: 0000000000000040
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84b7ae03
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86646857 R11: 0000000000000001 R12: ffffffff855191e0
R13: ffffffff85f036f0 R14: 0000000000000000 R15: 0000000000000000
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
kmem_cache_alloc_lru_noprof+0x84/0x690
ext4_alloc_inode+0x28/0x600
alloc_inode+0x67/0x250
new_inode+0x1e/0x160
__ext4_new_inode+0x35d/0x4d70
ext4_mkdir+0x331/0xb30
vfs_mkdir+0x59a/0x8d0
do_mkdirat+0x19f/0x3d0
__x64_sys_mkdir+0xf3/0x140
do_syscall_64+0xbf/0x390
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f91602f8c27
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 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:00007f915d86efa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000020000140 RCX: 00007f91602f8c27
RDX: 0000000000000004 RSI: 00000000000001ff RDI: 0000000020000100
RBP: 00007f915d86f040 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f915d86f000 R15: 0000000020000380
irq event stamp: 396
hardirqs last enabled at (395): [] dump_stack_lvl+0x113/0x120
hardirqs last disabled at (396): [] sysvec_apic_timer_interrupt+0xf/0x80
softirqs last enabled at (0): [] copy_process+0x1ee7/0x7410
softirqs last disabled at (0): [<0000000000000000>] 0x0
---[ end trace 0000000000000000 ]---
loop4: detected capacity change from 0 to 4
EXT4-fs (loop0): get root inode failed
EXT4-fs (loop0): mount failed
EXT4-fs (loop4): bad geometry: block count 128 exceeds size of device (1 blocks)
loop2: detected capacity change from 0 to 4
EXT4-fs (loop2): Couldn't mount because of unsupported optional features (c40000)
loop3: detected capacity change from 0 to 512
EXT4-fs error (device loop3): __ext4_fill_super:5512: inode #2: comm syz-executor.3: iget: bad extra_isize 63199 (inode size 512)
EXT4-fs (loop3): get root inode failed
EXT4-fs (loop3): mount failed
loop4: detected capacity change from 0 to 4
loop3: detected capacity change from 0 to 512
loop0: detected capacity change from 0 to 512
loop2: detected capacity change from 0 to 4
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 7768 Comm: syz-executor.2 Tainted: G W 6.18.0-rc2-next-20251024 #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_noprof+0x80/0x690
jbd2__journal_start+0x193/0x6b0
__ext4_journal_start_sb+0x325/0x5d0
__ext4_new_inode+0x2cbe/0x4d70
ext4_mkdir+0x331/0xb30
vfs_mkdir+0x59a/0x8d0
do_mkdirat+0x19f/0x3d0
__x64_sys_mkdir+0xf3/0x140
do_syscall_64+0xbf/0x390
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f91602f8c27
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 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:00007f915d86efa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000020000140 RCX: 00007f91602f8c27
RDX: 0000000000000004 RSI: 00000000000001ff RDI: 0000000020000100
RBP: 00007f915d86f040 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f915d86f000 R15: 0000000020000380
EXT4-fs error (device sda) in __ext4_new_inode:1086: Out of memory
EXT4-fs (loop4): bad geometry: block count 128 exceeds size of device (1 blocks)
EXT4-fs error (device loop0): __ext4_fill_super:5512: inode #2: comm syz-executor.0: iget: bad extra_isize 63199 (inode size 512)
EXT4-fs (loop0): get root inode failed
EXT4-fs (loop0): mount failed
EXT4-fs error (device loop3): __ext4_fill_super:5512: inode #2: comm syz-executor.3: iget: bad extra_isize 63199 (inode size 512)
EXT4-fs (loop3): get root inode failed
EXT4-fs (loop3): mount failed
loop4: detected capacity change from 0 to 4
EXT4-fs (loop4): bad geometry: block count 128 exceeds size of device (1 blocks)
----------------
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 86 97 72 fc callq 0xfc729793
d: e8 81 8e 9c fc callq 0xfc9c8e93
12: 48 89 ee mov %rbp,%rsi
15: 31 ff xor %edi,%edi
17: e8 87 58 bc fc callq 0xfcbc58a3
1c: e8 22 5d bc fc callq 0xfcbc5d43
21: e8 cd b9 c4 fc callq 0xfcc4b9f3
26: fb sti
27: 5b pop %rbx
* 28: 5d pop %rbp <-- trapping instruction
29: 41 5c pop %r12
2b: e9 13 5d bc fc jmpq 0xfcbc5d43
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