Hello, syzbot found the following issue on: HEAD commit: 7af08b57bcb9 Merge tag 'trace-v6.13-2' of git://git.kernel.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=15e03f5f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=29e5eaaea951b791 dashboard link: https://syzkaller.appspot.com/bug?extid=7c808908291a569281a9 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=162573c0580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=156dcd30580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/815d3cc889bc/disk-7af08b57.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fa365742e0ed/vmlinux-7af08b57.xz kernel image: https://storage.googleapis.com/syzbot-assets/ea9d8aace8b7/bzImage-7af08b57.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/83512543e1fa/mount_0.gz The issue was bisected to: commit 2b9ac22b12a266eb4fec246a07b504dd4983b16b Author: Kristian Klausen <kristian@xxxxxxxxxx> Date: Fri Jun 18 11:51:57 2021 +0000 loop: Fix missing discard support when using LOOP_CONFIGURE bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17166d30580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=14966d30580000 console output: https://syzkaller.appspot.com/x/log.txt?x=10966d30580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7c808908291a569281a9@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 2b9ac22b12a2 ("loop: Fix missing discard support when using LOOP_CONFIGURE") loop0: detected capacity change from 0 to 32768 Oops: divide error: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5857 Comm: syz-executor194 Not tainted 6.12.0-syzkaller-10689-g7af08b57bcb9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:dbAllocAG+0x414/0xd30 fs/jfs/jfs_dmap.c:1399 Code: 03 0f b6 0c 11 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 a7 08 00 00 41 8b 4d 2c 49 8d 7d 30 99 48 89 fe 48 c1 ee 03 <f7> f9 48 ba 00 00 00 00 00 fc ff df 0f b6 14 16 84 d2 74 09 80 fa RSP: 0018:ffffc9000450fbc8 EFLAGS: 00010216 RAX: 0000000000000400 RBX: 000000000000000a RCX: 0000000000000000 RDX: 0000000000000000 RSI: 1ffff11004cce406 RDI: ffff888026672030 RBP: 0000000000000000 R08: 0000000000000005 R09: 000000000000001f R10: 000000000000000a R11: 0000000000000002 R12: ffff88807650f000 R13: ffff888026672000 R14: 0000000000000000 R15: 000000000000000c FS: 000055558401d380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557f78216048 CR3: 00000000772e0000 CR4: 0000000000350ef0 Call Trace: <TASK> dbDiscardAG+0x249/0x7c0 fs/jfs/jfs_dmap.c:1613 jfs_ioc_trim+0x3fb/0x5c0 fs/jfs/jfs_discard.c:105 jfs_ioctl+0x335/0x430 fs/jfs/ioctl.c:131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc4a885b679 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc0fc54e38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffc0fc55008 RCX: 00007fc4a885b679 RDX: 0000000020000080 RSI: 00000000c0185879 RDI: 0000000000000004 RBP: 00007fc4a88d4610 R08: 0000000000000000 R09: 00007ffc0fc55008 R10: 0000000000005ea7 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc0fc54ff8 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dbAllocAG+0x414/0xd30 fs/jfs/jfs_dmap.c:1399 Code: 03 0f b6 0c 11 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 a7 08 00 00 41 8b 4d 2c 49 8d 7d 30 99 48 89 fe 48 c1 ee 03 <f7> f9 48 ba 00 00 00 00 00 fc ff df 0f b6 14 16 84 d2 74 09 80 fa RSP: 0018:ffffc9000450fbc8 EFLAGS: 00010216 RAX: 0000000000000400 RBX: 000000000000000a RCX: 0000000000000000 RDX: 0000000000000000 RSI: 1ffff11004cce406 RDI: ffff888026672030 RBP: 0000000000000000 R08: 0000000000000005 R09: 000000000000001f R10: 000000000000000a R11: 0000000000000002 R12: ffff88807650f000 R13: ffff888026672000 R14: 0000000000000000 R15: 000000000000000c FS: 000055558401d380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557f78216048 CR3: 00000000772e0000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 03 0f add (%rdi),%ecx 2: b6 0c mov $0xc,%dh 4: 11 48 89 adc %ecx,-0x77(%rax) 7: fa cli 8: 83 e2 07 and $0x7,%edx b: 83 c2 03 add $0x3,%edx e: 38 ca cmp %cl,%dl 10: 7c 08 jl 0x1a 12: 84 c9 test %cl,%cl 14: 0f 85 a7 08 00 00 jne 0x8c1 1a: 41 8b 4d 2c mov 0x2c(%r13),%ecx 1e: 49 8d 7d 30 lea 0x30(%r13),%rdi 22: 99 cltd 23: 48 89 fe mov %rdi,%rsi 26: 48 c1 ee 03 shr $0x3,%rsi * 2a: f7 f9 idiv %ecx <-- trapping instruction 2c: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 33: fc ff df 36: 0f b6 14 16 movzbl (%rsi,%rdx,1),%edx 3a: 84 d2 test %dl,%dl 3c: 74 09 je 0x47 3e: 80 .byte 0x80 3f: fa cli --- 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@xxxxxxxxxxxxxxxx. 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
