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Date: Sun, 23 Jun 2024 02:23:21 -0700 From: syzbot <syzbot+3d2944b5612507034fc4@...kaller.appspotmail.com> To: bfoster@...hat.com, kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [bcachefs?] kernel BUG in bch2_bucket_alloc_freelist Hello, syzbot found the following issue on: HEAD commit: 2ccbdf43d5e7 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15b13146980000 kernel config: https://syzkaller.appspot.com/x/.config?x=81c0d76ceef02b39 dashboard link: https://syzkaller.appspot.com/bug?extid=3d2944b5612507034fc4 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-2ccbdf43.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/13cdb5bfbafa/vmlinux-2ccbdf43.xz kernel image: https://storage.googleapis.com/syzbot-assets/7a14f5d07f81/bzImage-2ccbdf43.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3d2944b5612507034fc4@...kaller.appspotmail.com ------------[ cut here ]------------ kernel BUG at fs/bcachefs/alloc_foreground.c:489! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 3 PID: 5534 Comm: syz-executor.2 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:bch2_bucket_alloc_freelist+0xec0/0x1090 fs/bcachefs/alloc_foreground.c:489 Code: ff ff 48 8b bd 18 fe ff ff e8 7c ba 0a fe e9 19 f9 ff ff 48 8b bd 88 fe ff ff e8 db b9 0a fe e9 55 f9 ff ff e8 91 87 ad fd 90 <0f> 0b 4c 89 ef e8 c6 b9 0a fe e9 25 f8 ff ff 48 89 cf e8 e9 b9 0a RSP: 0018:ffffc90007fde1a0 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000019 RCX: ffffc90002f22000 RDX: 0000000000040000 RSI: ffffffff83e1083f RDI: 0000000000000007 RBP: ffffc90007fde3d0 R08: ffff8880217ce120 R09: 0000000000000000 R10: 0000000000000019 R11: 0000000000000001 R12: ffff8880217ce000 R13: ffff8880217ce2f8 R14: ffff88802bb94042 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f5f32b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000031c3b000 CR3: 0000000053c02000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bch2_bucket_alloc_trans+0x706/0xb20 fs/bcachefs/alloc_foreground.c:649 bch2_bucket_alloc_set_trans+0x466/0xd40 fs/bcachefs/alloc_foreground.c:810 __open_bucket_add_buckets+0x991/0x12f0 fs/bcachefs/alloc_foreground.c:1058 open_bucket_add_buckets+0x116/0x200 fs/bcachefs/alloc_foreground.c:1102 bch2_alloc_sectors_start_trans+0xa41/0x1ba0 fs/bcachefs/alloc_foreground.c:1457 __bch2_btree_node_alloc+0x718/0xdc0 fs/bcachefs/btree_update_interior.c:333 bch2_btree_reserve_get+0x21d/0x330 fs/bcachefs/btree_update_interior.c:547 bch2_btree_update_start+0x1235/0x1ed0 fs/bcachefs/btree_update_interior.c:1245 bch2_btree_split_leaf+0xc9/0x770 fs/bcachefs/btree_update_interior.c:1851 bch2_trans_commit_error+0x327/0xd00 fs/bcachefs/btree_trans_commit.c:918 __bch2_trans_commit+0x383b/0x7a40 fs/bcachefs/btree_trans_commit.c:1138 bch2_trans_commit fs/bcachefs/btree_update.h:170 [inline] bch2_logged_op_start+0x122/0x1b0 fs/bcachefs/logged_ops.c:83 bch2_truncate+0x173/0x240 fs/bcachefs/io_misc.c:291 bchfs_truncate+0x90c/0xd70 fs/bcachefs/fs-io.c:476 bch2_setattr+0x1ab/0x250 fs/bcachefs/fs.c:918 notify_change+0x742/0x11f0 fs/attr.c:497 do_truncate+0x15c/0x220 fs/open.c:65 handle_truncate fs/namei.c:3308 [inline] do_open fs/namei.c:3654 [inline] path_openat+0x2505/0x29f0 fs/namei.c:3807 do_filp_open+0x1dc/0x430 fs/namei.c:3834 do_sys_openat2+0x17a/0x1e0 fs/open.c:1405 do_sys_open fs/open.c:1420 [inline] __do_compat_sys_openat fs/open.c:1480 [inline] __se_compat_sys_openat fs/open.c:1478 [inline] __ia32_compat_sys_openat+0x16e/0x210 fs/open.c:1478 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7340579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5f325ac EFLAGS: 00000292 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 0000000020000080 RDX: 0000000000183341 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bch2_bucket_alloc_freelist+0xec0/0x1090 fs/bcachefs/alloc_foreground.c:489 Code: ff ff 48 8b bd 18 fe ff ff e8 7c ba 0a fe e9 19 f9 ff ff 48 8b bd 88 fe ff ff e8 db b9 0a fe e9 55 f9 ff ff e8 91 87 ad fd 90 <0f> 0b 4c 89 ef e8 c6 b9 0a fe e9 25 f8 ff ff 48 89 cf e8 e9 b9 0a RSP: 0018:ffffc90007fde1a0 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000019 RCX: ffffc90002f22000 RDX: 0000000000040000 RSI: ffffffff83e1083f RDI: 0000000000000007 RBP: ffffc90007fde3d0 R08: ffff8880217ce120 R09: 0000000000000000 R10: 0000000000000019 R11: 0000000000000001 R12: ffff8880217ce000 R13: ffff8880217ce2f8 R14: ffff88802bb94042 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88802c200000(0063) knlGS:00000000f5f32b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000560e79cc7088 CR3: 0000000053c02000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi --- 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 syzkaller@...glegroups.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
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