loop0: detected capacity change from 0 to 32768 loop0: detected capacity change from 32768 to 0 syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=232, nr_sectors = 8 limit=0 Read error 10 at 0x1d000 read_mapping_page failed! ERROR: (device loop0): txCommit: syz.0.0: attempt to access beyond end of device loop0: rw=2049, sector=64, nr_sectors = 8 limit=0 Buffer I/O error on dev loop0, logical block 8, lost sync page write ERROR: (device loop0): remounting filesystem as read-only syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=64, nr_sectors = 8 limit=0 syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=256, nr_sectors = 8 limit=0 Read error 10 at 0x0 read_mapping_page failed! jfs_mount_rw: diMount failed! Oops: general protection fault, probably for non-canonical address 0xdffffc0000000104: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000820-0x0000000000000827] CPU: 0 UID: 0 PID: 5362 Comm: syz.0.0 Not tainted 6.16.0-syzkaller-11241-g186f3edfdd41 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2665 [inline] RIP: 0010:diRead+0x151/0xb90 fs/jfs/jfs_imap.c:316 Code: 89 f0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 f7 e8 55 16 e7 fe 4c 89 64 24 50 4d 8b 36 4d 8d be 20 08 00 00 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 31 16 e7 fe 4d 8b 2f 4d 8d 7d 28 4c RSP: 0018:ffffc9000d4476b8 EFLAGS: 00010202 RAX: 0000000000000104 RBX: 0000000000000020 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000008 RDI: 00000000ffffffff RBP: dffffc0000000000 R08: ffff88805258a5b7 R09: 1ffff1100a4b14b6 R10: dffffc0000000000 R11: ffffed100a4b14b7 R12: ffff88805258a910 R13: ffff888052575318 R14: 0000000000000000 R15: 0000000000000820 FS: 00007f63433756c0(0000) GS:ffff88808d21f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f633640f000 CR3: 0000000043216000 CR4: 0000000000352ef0 Call Trace: jfs_iget+0x89/0x3e0 fs/jfs/inode.c:35 jfs_lookup+0x1c5/0x380 fs/jfs/namei.c:1469 lookup_open fs/namei.c:3686 [inline] open_last_lookups fs/namei.c:3807 [inline] path_openat+0x10fe/0x3830 fs/namei.c:4043 do_filp_open+0x1fa/0x410 fs/namei.c:4073 do_sys_openat2+0x121/0x1c0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1461 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f634258eb69 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6343375038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f63427b5fa0 RCX: 00007f634258eb69 RDX: 0000000000105042 RSI: 0000200000000080 RDI: ffffffffffffff9c RBP: 00007f6342611df1 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000001ff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f63427b5fa0 R15: 00007fff850dd568 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2665 [inline] RIP: 0010:diRead+0x151/0xb90 fs/jfs/jfs_imap.c:316 Code: 89 f0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 f7 e8 55 16 e7 fe 4c 89 64 24 50 4d 8b 36 4d 8d be 20 08 00 00 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 31 16 e7 fe 4d 8b 2f 4d 8d 7d 28 4c RSP: 0018:ffffc9000d4476b8 EFLAGS: 00010202 RAX: 0000000000000104 RBX: 0000000000000020 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000008 RDI: 00000000ffffffff RBP: dffffc0000000000 R08: ffff88805258a5b7 R09: 1ffff1100a4b14b6 R10: dffffc0000000000 R11: ffffed100a4b14b7 R12: ffff88805258a910 R13: ffff888052575318 R14: 0000000000000000 R15: 0000000000000820 FS: 00007f63433756c0(0000) GS:ffff88808d21f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f633640f000 CR3: 0000000043216000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 89 f0 mov %esi,%eax 2: 48 c1 e8 03 shr $0x3,%rax 6: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) a: 74 08 je 0x14 c: 4c 89 f7 mov %r14,%rdi f: e8 55 16 e7 fe call 0xfee71669 14: 4c 89 64 24 50 mov %r12,0x50(%rsp) 19: 4d 8b 36 mov (%r14),%r14 1c: 4d 8d be 20 08 00 00 lea 0x820(%r14),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 31 16 e7 fe call 0xfee71669 38: 4d 8b 2f mov (%r15),%r13 3b: 4d 8d 7d 28 lea 0x28(%r13),%r15 3f: 4c rex.WR