Hello, syzbot found the following issue on:
HEAD commit: f02769e7f272 Merge tag 'devicetree-fixes-for-6.16-1' of gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=133b83d4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=79da270cec5ffd65 dashboard link: https://syzkaller.appspot.com/bug?extid=cc7567f096079cb4146f compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-f02769e7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a454895505b7/vmlinux-f02769e7.xz kernel image: https://storage.googleapis.com/syzbot-assets/b5db986999e9/bzImage-f02769e7.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+cc7567f096079cb41...@syzkaller.appspotmail.com bcachefs (loop0): root directory missing, fixing done bcachefs (loop0): check_unreachable_inodes... bcachefs (loop0): unreachable inode: inum: 4100:4294967295 mode=40755 flags=(4300000) journal_seq=23 hash_seed=f497c5e8402f7aa5 hash_type=siphash bi_size=0 bi_sectors=0 bi_version=0 bi_atime=36304197331961109 bi_ctime=36304197331961109 bi_mtime=36304197331961109 bi_otime=36304197331961109 bi_uid=0 bi_gid=0 bi_nlink=0 bi_generation=0 bi_dev=0 bi_data_checksum=0 bi_compression=0 bi_project=0 bi_background_compression=0 bi_data_replicas=0 bi_promote_target=0 bi_foreground_target=0 bi_background_target=0 bi_erasure_code=0 bi_fields_set=0 bi_dir=0 bi_dir_offset=0 bi_subvol=0 bi_parent_subvol=0 bi_nocow=0 bi_depth=0 bi_inodes_32bit=0 bi_casefold=0, fixing bcachefs (loop0): creating (disconnected)/lost+found in subvol 1 snapshot 4294967295 bcachefs (loop0): creating (disconnected)/lost+found in subvol 1 snapshot 4294967295 bcachefs (loop0): creating (disconnected)/lost+found in subvol 1 snapshot 4294967295 bcachefs (loop0): creating (disconnected)/lost+found in subvol 1 snapshot 4294967295 bcachefs (loop0): creating (disconnected)/lost+found in subvol 1 snapshot 4294967295 done bcachefs (loop0): check_subvolume_structure... done bcachefs (loop0): check_directory_structure... bcachefs (loop0): directory structure loop: 4100:4294967295 4096:4294967295 4096:4294967295, fixing Kernel panic - not syncing: in transaction restart: transaction_restart_mem_realloced, last restarted by [<0>] btree_trans_restart_ip fs/bcachefs/btree_iter.h:364 [inline] [<0>] __bch2_trans_kmalloc+0x5d7/0xc80 fs/bcachefs/btree_iter.c:3216 [<0>] bch2_trans_kmalloc_ip fs/bcachefs/btree_iter.h:604 [inline] [<0>] bch2_trans_kmalloc fs/bcachefs/btree_iter.h:616 [inline] [<0>] bch2_hash_delete_at fs/bcachefs/str_hash.h:364 [inline] [<0>] bch2_fsck_remove_dirent+0x1032/0x12a0 fs/bcachefs/dirent.c:756 [<0>] remove_backpointer+0x1fe/0x280 fs/bcachefs/fsck.c:502 [<0>] check_path_loop fs/bcachefs/fsck.c:2700 [inline] [<0>] bch2_check_directory_structure+0x1a7f/0x1f00 fs/bcachefs/fsck.c:2733 [<0>] bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:485 [inline] [<0>] __bch2_run_recovery_passes+0x392/0x1010 fs/bcachefs/recovery_passes.c:540 [<0>] bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:611 [<0>] bch2_fs_recovery+0x25fd/0x3950 fs/bcachefs/recovery.c:989 [<0>] bch2_fs_start+0xa99/0xd90 fs/bcachefs/super.c:1203 [<0>] bch2_fs_get_tree+0xb02/0x14f0 fs/bcachefs/fs.c:2489 [<0>] vfs_get_tree+0x92/0x2b0 fs/super.c:1804 [<0>] do_new_mount+0x24a/0xa40 fs/namespace.c:3902 [<0>] do_mount fs/namespace.c:4239 [inline] [<0>] __do_sys_mount fs/namespace.c:4450 [inline] [<0>] __se_sys_mount+0x317/0x410 fs/namespace.c:4427 [<0>] do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] [<0>] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 [<0>] entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted 6.16.0-rc3-syzkaller-00121-gf02769e7f272 #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: <TASK> dump_stack_lvl+0x99/0x250 lib/dump_stack.c:120 panic+0x2db/0x790 kernel/panic.c:382 bch2_trans_in_restart_error+0xdb/0x110 fs/bcachefs/btree_iter.c:1455 bch2_trans_unlocked_or_in_restart_error+0xc2/0x110 fs/bcachefs/btree_iter.c:1468 bch2_trans_verify_not_unlocked_or_in_restart fs/bcachefs/btree_iter.h:344 [inline] bch2_path_get+0x108c/0x1540 fs/bcachefs/btree_iter.c:1747 bch2_trans_iter_init_common fs/bcachefs/btree_iter.h:529 [inline] bch2_trans_iter_init fs/bcachefs/btree_iter.h:543 [inline] __bch2_bkey_get_iter fs/bcachefs/btree_iter.h:631 [inline] bch2_bkey_get_iter fs/bcachefs/btree_iter.h:646 [inline] bch2_bi_depth_renumber_one fs/bcachefs/fsck.c:2573 [inline] bch2_bi_depth_renumber fs/bcachefs/fsck.c:2599 [inline] check_path_loop fs/bcachefs/fsck.c:2717 [inline] bch2_check_directory_structure+0x1376/0x1f00 fs/bcachefs/fsck.c:2733 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:485 [inline] __bch2_run_recovery_passes+0x392/0x1010 fs/bcachefs/recovery_passes.c:540 bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:611 bch2_fs_recovery+0x25fd/0x3950 fs/bcachefs/recovery.c:989 bch2_fs_start+0xa99/0xd90 fs/bcachefs/super.c:1203 bch2_fs_get_tree+0xb02/0x14f0 fs/bcachefs/fs.c:2489 vfs_get_tree+0x92/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3902 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4427 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f338f9900ca Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f339072ee68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f339072eef0 RCX: 00007f338f9900ca RDX: 0000200000000040 RSI: 0000200000000000 RDI: 00007f339072eeb0 RBP: 0000200000000040 R08: 00007f339072eef0 R09: 0000000000204000 R10: 0000000000204000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007f339072eeb0 R14: 000000000000598c R15: 0000200000000100 </TASK> Kernel Offset: disabled Rebooting in 86400 seconds.. --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkal...@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
