TCP: request_sock_TCP: Possible SYN flooding on port 2. Sending cookies. Check SNMP counters. BTRFS: device fsid 24c7a497-3402-47dd-bef8-82358f5f30e0 devid 1 transid 8 /dev/loop1 BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents ------------[ cut here ]------------ WARNING: CPU: 1 PID: 11557 at fs/btrfs/qgroup.c:3095 btrfs_qgroup_free_meta+0x3db/0x4d0 fs/btrfs/qgroup.c:3095 BTRFS error (device loop1): fail to start transaction for status update: -28 Kernel panic - not syncing: kernel: panic_on_warn set ... CPU: 1 PID: 11557 Comm: syz-executor.1 Not tainted 4.14.307-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 panic+0x21d/0x451 kernel/panic.c:247 check_panic_on_warn.cold+0x19/0x35 kernel/panic.c:171 __warn+0xdf/0x1e0 kernel/panic.c:603 report_bug+0x208/0x250 lib/bug.c:183 fixup_bug arch/x86/kernel/traps.c:177 [inline] fixup_bug arch/x86/kernel/traps.c:172 [inline] do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:967 RIP: 0010:btrfs_qgroup_free_meta+0x3db/0x4d0 fs/btrfs/qgroup.c:3095 RSP: 0018:ffff8880583e78a0 EFLAGS: 00010212 RAX: 0000000000040000 RBX: ffff88808fe2e640 RCX: ffffc9000760b000 RDX: 0000000000000b09 RSI: ffffffff82b3b22b RDI: ffff88808fe2ef60 RBP: 0000000000005000 R08: ffffffff8b9cb9c0 R09: 0000000000000002 R10: 0000000000000000 R11: ffff8880905f23c0 R12: ffff88805b500600 R13: 0000000000000005 R14: ffff88808fe2eb98 R15: 0000000000000002 start_transaction+0x637/0xf30 fs/btrfs/transaction.c:609 btrfs_create+0xf6/0x5d0 fs/btrfs/inode.c:6761 lookup_open+0x77a/0x1750 fs/namei.c:3241 do_last fs/namei.c:3334 [inline] path_openat+0xe08/0x2970 fs/namei.c:3571 do_filp_open+0x179/0x3c0 fs/namei.c:3605 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7f821e8340f9 RSP: 002b:00007f821cda6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f821e953f80 RCX: 00007f821e8340f9 RDX: 0000000000000000 RSI: 000000000014d27e RDI: 0000000020000180 RBP: 00007f821e88fae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffc355205f R14: 00007f821cda6300 R15: 0000000000022000 Kernel Offset: disabled Rebooting in 86400 seconds..