syzbot


kernel BUG in bch2_bio_compress (2)

Status: upstream: reported C repro on 2024/11/14 13:00
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+cb3fbcfb417448cfd278@syzkaller.appspotmail.com
Fix commit: bcachefs: Don't BUG_ON() when superblock feature wasn't set for compressed data
Patched on: [ci-upstream-linux-next-kasan-gce-root], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 22d, last: 11d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] kernel BUG in bch2_bio_compress (2) 0 (1) 2024/11/14 13:00
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in bch2_bio_compress bcachefs C done done 1 145d 145d 0/28 auto-obsoleted due to no activity on 2024/10/18 10:50

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/bcachefs/compress.c:398!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5328 Comm: bch-rebalance/l Not tainted 6.12.0-rc6-syzkaller-00279-gde2f378f2b77 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__bio_compress fs/bcachefs/compress.c:398 [inline]
RIP: 0010:bch2_bio_compress+0x13a1/0x13e0 fs/bcachefs/compress.c:498
Code: e1 07 38 c1 0f 8c 77 fb ff ff be 14 00 00 00 4c 89 ef e8 e2 36 d7 fd e9 65 fb ff ff e8 88 6f 6d fd 90 0f 0b e8 80 6f 6d fd 90 <0f> 0b e8 78 6f 6d fd 90 0f 0b e8 c0 fb 9f 07 e8 6b 6f 6d fd 90 0f
RSP: 0018:ffffc9000d166c20 EFLAGS: 00010293
RAX: ffffffff84276ae0 RBX: ffff888044747b18 RCX: ffff88801f3e4880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: ffffc9000d166eb0 R08: ffffffff8427593f R09: 0000000000000078
R10: ffffc9000d1672c0 R11: fffff52001a2ce5d R12: 0000000000000000
R13: ffff88804b67b668 R14: dffffc0000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005651105940d8 CR3: 000000000e734000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_write_extent fs/bcachefs/io_write.c:962 [inline]
 __bch2_write+0x151b/0x5dd0 fs/bcachefs/io_write.c:1458
 bch2_write+0x9b5/0x1760 fs/bcachefs/io_write.c:1631
 closure_queue include/linux/closure.h:270 [inline]
 closure_call include/linux/closure.h:432 [inline]
 bch2_data_update_read_done+0x22e/0x330 fs/bcachefs/data_update.c:426
 move_write fs/bcachefs/move.c:133 [inline]
 bch2_moving_ctxt_do_pending_writes+0x44c/0x8d0 fs/bcachefs/move.c:164
 bch2_moving_ctxt_flush_all+0x1c3/0x2f0 fs/bcachefs/move.c:179
 do_rebalance fs/bcachefs/rebalance.c:379 [inline]
 bch2_rebalance_thread+0x1a87/0x1fc0 fs/bcachefs/rebalance.c:401
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__bio_compress fs/bcachefs/compress.c:398 [inline]
RIP: 0010:bch2_bio_compress+0x13a1/0x13e0 fs/bcachefs/compress.c:498
Code: e1 07 38 c1 0f 8c 77 fb ff ff be 14 00 00 00 4c 89 ef e8 e2 36 d7 fd e9 65 fb ff ff e8 88 6f 6d fd 90 0f 0b e8 80 6f 6d fd 90 <0f> 0b e8 78 6f 6d fd 90 0f 0b e8 c0 fb 9f 07 e8 6b 6f 6d fd 90 0f
RSP: 0018:ffffc9000d166c20 EFLAGS: 00010293
RAX: ffffffff84276ae0 RBX: ffff888044747b18 RCX: ffff88801f3e4880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: ffffc9000d166eb0 R08: ffffffff8427593f R09: 0000000000000078
R10: ffffc9000d1672c0 R11: fffff52001a2ce5d R12: 0000000000000000
R13: ffff88804b67b668 R14: dffffc0000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fddecdff000 CR3: 0000000011e72000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/11/10 16:39 upstream de2f378f2b77 6b856513 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in bch2_bio_compress
2024/11/10 14:18 upstream de2f378f2b77 6b856513 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in bch2_bio_compress
2024/11/22 07:06 upstream 28eb75e178d3 4b25d554 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_bio_compress
2024/11/10 12:52 upstream de2f378f2b77 6b856513 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_bio_compress
* Struck through repros no longer work on HEAD.