[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.150' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 51.333907] BTRFS: device fsid 24c7a497-3402-47dd-bef8-82358f5f30e0 devid 1 transid 8 /dev/loop5 [ 51.366554] BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor211 (8128) [ 51.403717] BTRFS info (device loop5): enabling inode map caching [ 51.405386] BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor211 (8133) [ 51.426405] BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor211 (8138) [ 51.426758] BTRFS info (device loop5): force clearing of disk cache [ 51.451680] BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by syz-executor211 (8135) [ 51.459000] BTRFS info (device loop5): force zlib compression, level 3 [ 51.471676] hrtimer: interrupt took 52418 ns [ 51.474152] BTRFS info (device loop5): using free space tree [ 51.478089] BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by systemd-udevd (8158) [ 51.483632] BTRFS info (device loop5): has skinny extents [ 51.494165] BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor211 (8137) executing program executing program executing program [ 51.565582] BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (8171) executing program executing program [ 51.632856] BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (8161) [ 51.683173] BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by systemd-udevd (8166) [ 51.755983] BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (8163) [ 51.816510] BTRFS info (device loop5): clearing free space tree [ 51.839453] BTRFS info (device loop5): clearing 1 ro feature flag [ 51.873237] BTRFS info (device loop5): clearing 2 ro feature flag [ 51.951688] BTRFS info (device loop5): creating free space tree [ 51.969444] BTRFS info (device loop5): setting 1 ro feature flag [ 51.992600] BTRFS info (device loop5): setting 2 ro feature flag [ 52.211959] BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor211 (8196) [ 52.212918] WARNING: CPU: 1 PID: 8215 at fs/btrfs/free-space-cache.c:1493 tree_insert_offset+0x127/0x270 [ 52.233393] Kernel panic - not syncing: panic_on_warn set ... [ 52.233393] [ 52.240766] CPU: 1 PID: 8215 Comm: btrfs-ino-cache Not tainted 4.19.211-syzkaller #0 [ 52.248643] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 52.257995] Call Trace: [ 52.260588] dump_stack+0x1fc/0x2ef [ 52.264220] panic+0x26a/0x50e [ 52.264687] BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor211 (8197) [ 52.267408] ? __warn_printk+0xf3/0xf3 [ 52.267431] ? tree_insert_offset+0x127/0x270 [ 52.267445] ? __probe_kernel_read+0x130/0x1b0 [ 52.267456] ? __warn.cold+0x5/0x5a [ 52.267465] ? __warn+0xe4/0x200 [ 52.267479] ? tree_insert_offset+0x127/0x270 [ 52.304834] __warn.cold+0x20/0x5a [ 52.308379] ? tree_insert_offset+0x127/0x270 [ 52.312882] report_bug+0x262/0x2b0 [ 52.316516] do_error_trap+0x1d7/0x310 [ 52.320406] ? math_error+0x310/0x310 [ 52.324208] ? __lock_acquire+0x22f9/0x3ff0 [ 52.328527] ? error_entry+0x72/0xd0 [ 52.332252] ? trace_hardirqs_off_caller+0x6e/0x210 [ 52.337270] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.342121] invalid_op+0x14/0x20 [ 52.345568] RIP: 0010:tree_insert_offset+0x127/0x270 [ 52.350648] Code: 89 ef e8 5c c7 6c fe 4c 39 e5 0f 86 50 ff ff ff e8 3e c6 6c fe 48 8d 6b 10 eb 9f e8 33 c6 6c fe 48 85 ed 75 eb e8 29 c6 6c fe <0f> 0b 41 bc ef ff ff ff e9 a0 00 00 00 e8 17 c6 6c fe e8 12 c6 6c [ 52.369528] RSP: 0018:ffff8880aec07c78 EFLAGS: 00010293 [ 52.374868] RAX: ffff888095362000 RBX: ffff88809decaea0 RCX: ffffffff82f5bebb [ 52.382116] RDX: 0000000000000000 RSI: ffffffff82f5bf47 RDI: 0000000000000005 [ 52.389363] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 52.396607] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000102 [ 52.403860] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88809decae38 [ 52.411118] ? tree_insert_offset+0x9b/0x270 [ 52.415506] ? tree_insert_offset+0x127/0x270 [ 52.419978] ? tree_insert_offset+0x127/0x270 [ 52.424454] __btrfs_add_free_space+0x1a8/0xe40 [ 52.429102] ? btrfs_unpin_free_ino+0x16d/0x360 [ 52.433751] btrfs_unpin_free_ino+0x28e/0x360 [ 52.438228] caching_kthread+0x82f/0x970 [ 52.442272] ? btrfs_unpin_free_ino+0x360/0x360 [ 52.446918] ? lock_acquire+0x170/0x3c0 [ 52.450871] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 52.455952] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 52.460511] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 52.465594] ? __kthread_parkme+0x133/0x1e0 [ 52.469897] ? btrfs_unpin_free_ino+0x360/0x360 [ 52.474543] kthread+0x33f/0x460 [ 52.477899] ? kthread_park+0x180/0x180 [ 52.481940] ret_from_fork+0x24/0x30 [ 52.485983] Kernel Offset: disabled [ 52.489648] Rebooting in 86400 seconds..