Hello, syzbot found the following issue on: HEAD commit: 910bfc26d16d Merge tag 'rust-6.11' of https://github.com/R.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12ffeda1980000 kernel config: https://syzkaller.appspot.com/x/.config?x=b698a1b2fcd7ef5f dashboard link: https://syzkaller.appspot.com/bug?extid=ecafa838512962d7d7f6 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=14af8cd9980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a426f9980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/863d9befadf0/disk-910bfc26.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/431d0c4adec0/vmlinux-910bfc26.xz kernel image: https://storage.googleapis.com/syzbot-assets/5be5e371ff13/bzImage-910bfc26.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/39d480966a2c/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=11660f0d980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=13660f0d980000 console output: https://syzkaller.appspot.com/x/log.txt?x=15660f0d980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ecafa838512962d7d7f6@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 2b9ac22b12a2 ("loop: Fix missing discard support when using LOOP_CONFIGURE") loop0: detected capacity change from 0 to 32768 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 5215 Comm: syz-executor143 Not tainted 6.10.0-syzkaller-12857-g910bfc26d16d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:dbFree+0x10f/0x680 fs/jfs/jfs_dmap.c:368 Code: 17 4d 4e fe 31 ff 4c 89 e6 e8 6d dd 72 fe 4d 85 e4 0f 84 e2 04 00 00 4c 89 f1 4f 8d 74 25 00 48 8b 14 24 48 89 d0 48 c1 e8 03 <80> 3c 08 00 74 0d 48 8b 3c 24 e8 92 eb d6 fe 48 8b 14 24 48 8b 1a RSP: 0018:ffffc90003bc7bb0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88802a22a2a0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 RBP: ffff888025086000 R08: ffffffff8320a9f3 R09: 1ffff1100f474141 R10: dffffc0000000000 R11: ffffed100f474142 R12: 0000000000000100 R13: 0000000000000100 R14: 0000000000000200 R15: ffff88807a3a2000 FS: 00007f47de10c6c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f47de0ebd58 CR3: 00000000799c8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> dbDiscardAG+0x8a9/0xa20 fs/jfs/jfs_dmap.c:1650 jfs_ioc_trim+0x433/0x670 fs/jfs/jfs_discard.c:100 jfs_ioctl+0x2d0/0x3e0 fs/jfs/ioctl.c:131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f47de156789 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f47de10c218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f47de1e36c8 RCX: 00007f47de156789 RDX: 0000000020000080 RSI: 00000000c0185879 RDI: 0000000000000004 RBP: 00007f47de1e36c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f47de1b0084 R13: 00007f47de1aa07e R14: 0037656c69662f2e R15: 3333222211110000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dbFree+0x10f/0x680 fs/jfs/jfs_dmap.c:368 Code: 17 4d 4e fe 31 ff 4c 89 e6 e8 6d dd 72 fe 4d 85 e4 0f 84 e2 04 00 00 4c 89 f1 4f 8d 74 25 00 48 8b 14 24 48 89 d0 48 c1 e8 03 <80> 3c 08 00 74 0d 48 8b 3c 24 e8 92 eb d6 fe 48 8b 14 24 48 8b 1a RSP: 0018:ffffc90003bc7bb0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88802a22a2a0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 RBP: ffff888025086000 R08: ffffffff8320a9f3 R09: 1ffff1100f474141 R10: dffffc0000000000 R11: ffffed100f474142 R12: 0000000000000100 R13: 0000000000000100 R14: 0000000000000200 R15: ffff88807a3a2000 FS: 00007f47de10c6c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f47de192190 CR3: 00000000799c8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 4d rex.WRB 1: 4e fe rex.WRX (bad) 3: 31 ff xor %edi,%edi 5: 4c 89 e6 mov %r12,%rsi 8: e8 6d dd 72 fe call 0xfe72dd7a d: 4d 85 e4 test %r12,%r12 10: 0f 84 e2 04 00 00 je 0x4f8 16: 4c 89 f1 mov %r14,%rcx 19: 4f 8d 74 25 00 lea 0x0(%r13,%r12,1),%r14 1e: 48 8b 14 24 mov (%rsp),%rdx 22: 48 89 d0 mov %rdx,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2d: 74 0d je 0x3c 2f: 48 8b 3c 24 mov (%rsp),%rdi 33: e8 92 eb d6 fe call 0xfed6ebca 38: 48 8b 14 24 mov (%rsp),%rdx 3c: 48 8b 1a mov (%rdx),%rbx --- 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
