Hello, syzbot found the following issue on:
HEAD commit: a4cda136f021 Add linux-next specific files for 20250404 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=12c3db4c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8a257c454bb1afb7 dashboard link: https://syzkaller.appspot.com/bug?extid=aec9606169fbc3a12ca6 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17ca0c04580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11c3db4c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/59048bc9c206/disk-a4cda136.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ad2ba7306f20/vmlinux-a4cda136.xz kernel image: https://storage.googleapis.com/syzbot-assets/b3bef7acbf10/bzImage-a4cda136.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/110624be1513/mount_0.gz The issue was bisected to: commit dcffc3b1ae3251d796a25c673f614e3099ca83d3 Author: Kent Overstreet <[email protected]> Date: Sun Mar 30 03:11:08 2025 +0000 bcachefs: Split up bch_dev.io_ref bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13948c04580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=10548c04580000 console output: https://syzkaller.appspot.com/x/log.txt?x=17948c04580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: [email protected] Fixes: dcffc3b1ae32 ("bcachefs: Split up bch_dev.io_ref") bcachefs (loop0): shutting down ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5844 at fs/bcachefs/super.c:1229 bch2_dev_free+0x228/0x290 fs/bcachefs/super.c:1229 Modules linked in: CPU: 0 UID: 0 PID: 5844 Comm: syz-executor121 Not tainted 6.14.0-next-20250404-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:bch2_dev_free+0x228/0x290 fs/bcachefs/super.c:1229 Code: ff e8 4c cf 74 00 4c 89 ef e8 44 cf 74 00 48 89 df 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 ee 53 96 07 e8 59 e9 32 fd 90 <0f> 0b 90 e9 09 fe ff ff e8 4b e9 32 fd 90 0f 0b 90 e9 15 fe ff ff RSP: 0018:ffffc9000406fb88 EFLAGS: 00010293 RAX: ffffffff849073d7 RBX: ffff888035282000 RCX: ffff888034af9e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880352820c0 R08: ffffffff850552f7 R09: 0000000000000000 R10: ffff888035282208 R11: ffffed1006a5044a R12: ffff888075e003f0 R13: ffff8880352820b0 R14: ffff888075e00000 R15: ffff888075e007b2 FS: 000055558bb20380(0000) GS:ffff888124f8f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000045bdd0 CR3: 00000000122a0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bch2_fs_free+0x2b0/0x400 fs/bcachefs/super.c:688 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x422/0x4c0 fs/namespace.c:1435 task_work_run+0x251/0x310 kernel/task_work.c:227 ptrace_notify+0x2dc/0x390 kernel/signal.c:2520 ptrace_report_syscall include/linux/ptrace.h:415 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline] syscall_exit_work+0xc7/0x1d0 kernel/entry/common.c:173 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline] syscall_exit_to_user_mode+0x24a/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f49b0cec447 Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffd94723978 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f49b0cec447 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd94723a30 RBP: 00007ffd94723a30 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffd94724aa0 R13: 000055558bb216c0 R14: 0000000000000001 R15: 431bde82d7b634db </TASK> --- 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 [email protected]. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
