Kernel panic - not syncing: kernel: panic_on_warn set ... CPU: 1 UID: 0 PID: 14732 Comm: syz.2.12715 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x3d/0x1f0 lib/dump_stack.c:120 vpanic+0x640/0x6f0 kernel/panic.c:489 panic+0xca/0xd0 kernel/panic.c:626 check_panic_on_warn kernel/panic.c:376 [inline] check_panic_on_warn+0xab/0xb0 kernel/panic.c:371 __warn+0xf6/0x3c0 kernel/panic.c:897 __report_bug lib/bug.c:195 [inline] report_bug+0x3c3/0x580 lib/bug.c:215 handle_bug+0x184/0x210 arch/x86/kernel/traps.c:338 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:392 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616 RIP: 0010:obj_cgroup_memcg include/linux/memcontrol.h:381 [inline] RIP: 0010:folio_memcg include/linux/memcontrol.h:449 [inline] RIP: 0010:folio_memcg+0x2de/0x380 include/linux/memcontrol.h:446 Code: 88 5b 95 ff be ff ff ff ff 48 c7 c7 88 00 42 8e e8 d7 89 36 09 31 ff 89 c3 89 c6 e8 ac 56 95 ff 85 db 75 87 e8 63 5b 95 ff 90 <0f> 0b 90 e9 79 ff ff ff e8 55 5b 95 ff 48 c7 c6 40 f1 9d 8b 48 89 RSP: 0018:ffffc90006f57138 EFLAGS: 00010287 RAX: 0000000000009b22 RBX: 0000000000000000 RCX: ffffc9002b110000 RDX: 0000000000080000 RSI: ffffffff8226fc1d RDI: 0000000000000005 RBP: ffff88806b365600 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000002 R13: 0000000000000000 R14: ffffea00017e8000 R15: ffffea00017e8000 get_deferred_split_queue mm/huge_memory.c:1084 [inline] __folio_split+0xad/0x4d40 mm/huge_memory.c:3602 madvise_cold_or_pageout_pte_range+0x1385/0x20d0 mm/madvise.c:505 walk_pmd_range mm/pagewalk.c:130 [inline] walk_pud_range mm/pagewalk.c:224 [inline] walk_p4d_range mm/pagewalk.c:262 [inline] walk_pgd_range+0xc05/0x1f50 mm/pagewalk.c:303 __walk_page_range+0x163/0x820 mm/pagewalk.c:410 walk_page_range_vma+0x2c7/0xa20 mm/pagewalk.c:717 madvise_pageout_page_range mm/madvise.c:624 [inline] madvise_pageout+0x257/0x540 mm/madvise.c:649 madvise_vma_behavior+0xb14/0x2d50 mm/madvise.c:1352 madvise_walk_vmas+0x31f/0x9c0 mm/madvise.c:1669 madvise_do_behavior+0x1e2/0x530 mm/madvise.c:1885 do_madvise+0x176/0x240 mm/madvise.c:1978 __do_sys_madvise mm/madvise.c:1987 [inline] __se_sys_madvise mm/madvise.c:1985 [inline] __ia32_sys_madvise+0xa7/0x110 mm/madvise.c:1985 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x7c/0x300 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f06579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f53f655c EFLAGS: 00000296 ORIG_RAX: 00000000000000db RAX: ffffffffffffffda RBX: 0000000080000000 RCX: 00000000ffffffff RDX: 0000000000000015 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi