------------[ cut here ]------------ VFS: brelse: Trying to free free buffer WARNING: CPU: 1 PID: 14135 at fs/buffer.c:1144 __brelse fs/buffer.c:1144 [inline] WARNING: CPU: 1 PID: 14135 at fs/buffer.c:1144 __brelse+0x67/0xa0 fs/buffer.c:1138 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 14135 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 panic+0x26a/0x50e kernel/panic.c:186 __warn.cold+0x20/0x5a kernel/panic.c:541 report_bug+0x262/0x2b0 lib/bug.c:183 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 RIP: 0010:__brelse fs/buffer.c:1144 [inline] RIP: 0010:__brelse+0x67/0xa0 fs/buffer.c:1138 Code: 7c 04 84 d2 75 4e 44 8b 63 60 31 ff 44 89 e6 e8 bf 16 b2 ff 45 85 e4 75 1c e8 45 15 b2 ff 48 c7 c7 e0 1c 75 88 e8 1e 4d 42 06 <0f> 0b 5b 5d 41 5c e9 2e 15 b2 ff e8 29 15 b2 ff be 04 00 00 00 48 RSP: 0018:ffff8880ba107f40 EFLAGS: 00010082 RAX: 0000000000000000 RBX: ffff8880423fb2a0 RCX: 0000000000000000 RDX: 0000000000010000 RSI: ffffffff814dff01 RDI: ffffed1017420fda RBP: ffff8880423fb300 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: ffffffff8c66505b R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880ba1287e0 R15: 0000000000000000 brelse include/linux/buffer_head.h:297 [inline] invalidate_bh_lru+0x90/0x140 fs/buffer.c:1385 flush_smp_call_function_queue+0x144/0x4d0 kernel/smp.c:243 smp_call_function_single_interrupt+0x98/0x440 arch/x86/kernel/smp.c:304 call_function_single_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:916 RIP: 0010:__find_get_block+0x284/0xde0 fs/buffer.c:1293 Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 64 0a 00 00 48 83 3d 96 0b 41 08 00 0f 84 bf 04 00 00 e8 63 0e b2 ff fb 66 0f 1f 44 00 00 <4d> 85 e4 0f 84 52 02 00 00 e8 4e 0e b2 ff 0f 1f 44 00 00 e8 44 0e RSP: 0018:ffff8880a9e37ac0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff04 RAX: ffff88809b0fa140 RBX: 0000000000000000 RCX: 1ffff1101361f542 RDX: 0000000000000000 RSI: ffffffff81b0770d RDI: ffff88809b0fa9c4 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808a9401f8 R13: 0000000000000387 R14: 0000000000001000 R15: ffff88808a9401f8 sb_find_get_block include/linux/buffer_head.h:346 [inline] recently_deleted fs/ext4/ialloc.c:684 [inline] find_inode_bit+0x213/0x520 fs/ext4/ialloc.c:724 __ext4_new_inode+0x160c/0x5a20 fs/ext4/ialloc.c:916 ext4_symlink+0x3f5/0xc00 fs/ext4/namei.c:3176 vfs_symlink+0x453/0x6c0 fs/namei.c:4129 do_symlinkat+0x258/0x2c0 fs/namei.c:4156 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f7621364a07 Code: 73 01 c3 48 c7 c1 b8 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 0a 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff78be2b38 EFLAGS: 00000202 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7621364a07 RDX: 00007f76213c0b9e RSI: 00000000ffffff9c RDI: 00007fff78be2c00 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fff78be29d0 R10: 00007fff78be2887 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007fff78be2c00 Kernel Offset: disabled Rebooting in 86400 seconds.. ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 64 0a 00 00 jne 0xa72 e: 48 83 3d 96 0b 41 08 cmpq $0x0,0x8410b96(%rip) # 0x8410bac 15: 00 16: 0f 84 bf 04 00 00 je 0x4db 1c: e8 63 0e b2 ff callq 0xffb20e84 21: fb sti 22: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) * 28: 4d 85 e4 test %r12,%r12 <-- trapping instruction 2b: 0f 84 52 02 00 00 je 0x283 31: e8 4e 0e b2 ff callq 0xffb20e84 36: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 3b: e8 .byte 0xe8 3c: 44 0e rex.R (bad)