loop0: detected capacity change from 32768 to 0 Aborting journal on device loop0-75. JBD2: previous I/O error detected for journal superblock update for loop0-75. syz.0.0: attempt to access beyond end of device loop0: rw=38913, sector=640, nr_sectors = 1 limit=0 Buffer I/O error on dev loop0, logical block 640, lost sync page write (syz.0.0,5327,0):__ocfs2_journal_access:705 ERROR: Error -5 getting 1 access to buffer! (syz.0.0,5327,0):ocfs2_write_end_nolock:1949 ERROR: status = -5 (syz.0.0,5327,0):ocfs2_commit_trans:382 ERROR: status = -5 ------------[ cut here ]------------ kernel BUG at fs/ocfs2/mmap.c:107! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted 6.14.0-rc6-syzkaller-00003-g4d872d51bc9d #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:__ocfs2_page_mkwrite fs/ocfs2/mmap.c:107 [inline] RIP: 0010:ocfs2_page_mkwrite+0xd9d/0xda0 fs/ocfs2/mmap.c:144 Code: ff df 4d 89 fc e9 87 f3 ff ff 48 ff cb e8 fb f0 00 fe 49 89 dc 49 be 00 00 00 00 00 fc ff df e9 6d f3 ff ff e8 e4 f0 00 fe 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e RSP: 0018:ffffc9000d5572a0 EFLAGS: 00010287 RAX: ffffffff83c0ee2c RBX: 00000000fffffffb RCX: 0000000000100000 RDX: ffffc9000f7a1000 RSI: 000000000000d8a2 RDI: 000000000000d8a3 RBP: ffffc9000d557460 R08: ffffffff83c0ec1e R09: 1ffffffff28a9929 R10: dffffc0000000000 R11: fffffbfff28a992a R12: 0000000000001000 R13: 0000000000034000 R14: ffffea0001555900 R15: 0000000000000000 FS: 00007f1e73a366c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000034c00 CR3: 00000000439bc000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_page_mkwrite+0x15c/0x350 mm/memory.c:3257 do_shared_fault mm/memory.c:5486 [inline] do_fault mm/memory.c:5548 [inline] do_pte_missing mm/memory.c:4060 [inline] handle_pte_fault mm/memory.c:5907 [inline] __handle_mm_fault+0x22e2/0x70f0 mm/memory.c:6050 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6219 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:71 Code: 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 a4 c3 cc cc cc cc 48 89 c8 48 c1 e9 03 83 e0 07 f3 48 a5 89 c1 RSP: 0018:ffffc9000d557ac8 EFLAGS: 00050246 RAX: ffffffff84f59301 RBX: 0000400000034c40 RCX: 0000000000000040 RDX: 0000000000000000 RSI: ffffc9000d557b60 RDI: 0000400000034c00 RBP: ffffc9000d557c10 R08: ffffc9000d557b9f R09: 1ffff92001aaaf73 R10: dffffc0000000000 R11: fffff52001aaaf74 R12: 0000000000000040 R13: 00007ffffffff000 R14: ffffc9000d557b60 R15: 0000400000034c00 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] _inline_copy_to_user include/linux/uaccess.h:197 [inline] _copy_to_user+0x8b/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] rng_dev_read+0x3ed/0x720 drivers/char/hw_random/core.c:258 do_loop_readv_writev fs/read_write.c:840 [inline] vfs_readv+0x6bc/0xa80 fs/read_write.c:1013 do_preadv fs/read_write.c:1125 [inline] __do_sys_preadv fs/read_write.c:1172 [inline] __se_sys_preadv fs/read_write.c:1167 [inline] __x64_sys_preadv+0x1b7/0x2d0 fs/read_write.c:1167 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: 0033:0x7f1e72b8d169 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:00007f1e73a36038 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007f1e72da6080 RCX: 00007f1e72b8d169 RDX: 0000000000000001 RSI: 0000400000000240 RDI: 000000000000000f RBP: 00007f1e72c0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1e72da6080 R15: 00007ffe09a04718 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__ocfs2_page_mkwrite fs/ocfs2/mmap.c:107 [inline] RIP: 0010:ocfs2_page_mkwrite+0xd9d/0xda0 fs/ocfs2/mmap.c:144 Code: ff df 4d 89 fc e9 87 f3 ff ff 48 ff cb e8 fb f0 00 fe 49 89 dc 49 be 00 00 00 00 00 fc ff df e9 6d f3 ff ff e8 e4 f0 00 fe 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e RSP: 0018:ffffc9000d5572a0 EFLAGS: 00010287 RAX: ffffffff83c0ee2c RBX: 00000000fffffffb RCX: 0000000000100000 RDX: ffffc9000f7a1000 RSI: 000000000000d8a2 RDI: 000000000000d8a3 RBP: ffffc9000d557460 R08: ffffffff83c0ec1e R09: 1ffffffff28a9929 R10: dffffc0000000000 R11: fffffbfff28a992a R12: 0000000000001000 R13: 0000000000034000 R14: ffffea0001555900 R15: 0000000000000000 FS: 00007f1e73a366c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564b18cf90f8 CR3: 00000000439bc000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 75 f1 jne 0xfffffff3 2: c3 ret 3: cc int3 4: cc int3 5: cc int3 6: cc int3 7: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) e: 00 00 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 df je 0x2 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c9 jmp 0xfffffff3 * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: cc int3 2e: cc int3 2f: cc int3 30: cc int3 31: 48 89 c8 mov %rcx,%rax 34: 48 c1 e9 03 shr $0x3,%rcx 38: 83 e0 07 and $0x7,%eax 3b: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) 3e: 89 c1 mov %eax,%ecx