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Date: Sat, 18 May 2024 20:09:33 -0700 From: syzbot <syzbot+b643774cddb3862d7886@...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?] WARNING in bch2_writepage_io_done Hello, syzbot found the following issue on: HEAD commit: 6bfd2d442af5 Merge tag 'irq-core-2024-05-12' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=164a1c3f180000 kernel config: https://syzkaller.appspot.com/x/.config?x=395546166dcfe360 dashboard link: https://syzkaller.appspot.com/bug?extid=b643774cddb3862d7886 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-6bfd2d44.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7ad901fe99c6/vmlinux-6bfd2d44.xz kernel image: https://storage.googleapis.com/syzbot-assets/8d6ef2df621f/bzImage-6bfd2d44.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b643774cddb3862d7886@...kaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 2 PID: 5296 at fs/bcachefs/fs-io-buffered.c:438 bch2_writepage_io_done+0x8fc/0xe20 fs/bcachefs/fs-io-buffered.c:438 Modules linked in: CPU: 2 PID: 5296 Comm: syz-executor.1 Not tainted 6.9.0-syzkaller-01893-g6bfd2d442af5 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:bch2_writepage_io_done+0x8fc/0xe20 fs/bcachefs/fs-io-buffered.c:438 Code: ff e8 28 5d 90 fd 8b 84 24 88 00 00 00 48 8b 74 24 08 48 8b 7c 24 10 8d 50 01 89 04 24 e8 cc ec ff ff eb c5 e8 05 5d 90 fd 90 <0f> 0b 90 e8 fc 5c 90 fd 48 8b 44 24 18 48 8d 78 f8 48 b8 00 00 00 RSP: 0018:ffffc90002c173b8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000008 RCX: ffffffff83fe3d29 RDX: ffff88801ec48000 RSI: ffffffff83fe447b RDI: 0000000000000007 RBP: 0000000000000008 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000002 R12: ffffea00019079c0 R13: ffff888060fe5700 R14: dffffc0000000000 R15: 0000000000000008 FS: 0000000000000000(0000) GS:ffff88802c400000(0063) knlGS:00000000f5eedb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000055680e9c9e18 CR3: 000000005d36e000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bch2_write_done+0x243/0x400 fs/bcachefs/io_write.c:478 bch2_write_data_inline fs/bcachefs/io_write.c:1550 [inline] bch2_write+0xab2/0x13f0 fs/bcachefs/io_write.c:1616 bch2_writepages+0x136/0x200 fs/bcachefs/fs-io-buffered.c:660 do_writepages+0x1a3/0x7f0 mm/page-writeback.c:2613 filemap_fdatawrite_wbc mm/filemap.c:397 [inline] filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387 __filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430 file_write_and_wait_range+0xd0/0x140 mm/filemap.c:788 bch2_fsync+0xa1/0x2a0 fs/bcachefs/fs-io.c:197 vfs_fsync_range+0x141/0x230 fs/sync.c:188 generic_write_sync include/linux/fs.h:2811 [inline] bch2_buffered_write fs/bcachefs/fs-io-buffered.c:1136 [inline] bch2_write_iter+0x756/0x3180 fs/bcachefs/fs-io-buffered.c:1144 call_write_iter include/linux/fs.h:2120 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6b6/0x1120 fs/read_write.c:590 ksys_write+0x12f/0x260 fs/read_write.c:643 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x75/0x120 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: 0023:0xf72fb579 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:00000000f5eed5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000020001900 RDX: 000000000000000b RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ---------------- 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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