------------[ cut here ]------------ kernel BUG at fs/ocfs2/suballoc.c:922! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:ocfs2_reserve_suballoc_bits+0x40c6/0x4850 fs/ocfs2/suballoc.c:922 Code: 00 00 e9 2b f1 ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c cc da ff ff 48 89 df e8 c5 e4 42 fe e9 bf da ff ff e8 bb 3d d1 fd 90 <0f> 0b 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 62 dc ff ff 4c 89 f7 RSP: 0018:ffffc9000f77dec0 EFLAGS: 00010246 RAX: ffffffff83f6a5b5 RBX: 00000000ffffffff RCX: 0000000000100000 RDX: ffffc90020001000 RSI: 00000000000fffff RDI: 0000000000100000 RBP: ffffc9000f77e390 R08: ffffffff907a627f R09: 1ffffffff20f4c4f R10: dffffc0000000000 R11: fffffbfff20f4c50 R12: ffff88801fc7dc60 R13: ffff88804390fe00 R14: dffffc0000000000 R15: fffff52001eefc04 FS: 00007fdbf00a36c0(0000) GS:ffff88808c2c6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000003fc000 CR3: 0000000012b80000 CR4: 0000000000352ef0 Call Trace: ocfs2_reserve_cluster_bitmap_bits+0xc4/0x1d0 fs/ocfs2/suballoc.c:1250 ocfs2_local_alloc_reserve_for_window fs/ocfs2/localalloc.c:1106 [inline] ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1242 [inline] ocfs2_reserve_local_alloc_bits+0x8d0/0x2680 fs/ocfs2/localalloc.c:669 ocfs2_reserve_clusters_with_limit+0x1b9/0xc20 fs/ocfs2/suballoc.c:1284 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1345 [inline] ocfs2_lock_allocators+0x2d1/0x5f0 fs/ocfs2/suballoc.c:3120 ocfs2_write_begin_nolock+0x1b7b/0x41f0 fs/ocfs2/aops.c:1720 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:92 [inline] ocfs2_page_mkwrite+0x640/0xb60 fs/ocfs2/mmap.c:143 do_page_mkwrite+0x147/0x310 mm/memory.c:3816 do_shared_fault mm/memory.c:6076 [inline] do_fault mm/memory.c:6138 [inline] do_pte_missing+0x757/0x34b0 mm/memory.c:4700 handle_pte_fault mm/memory.c:6558 [inline] __handle_mm_fault mm/memory.c:6707 [inline] handle_mm_fault+0x1a53/0x3750 mm/memory.c:6876 do_user_addr_fault+0x746/0x1340 arch/x86/mm/fault.c:1394 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0010:rep_movs_alternative+0x4a/0xa0 arch/x86/lib/copy_user_64.S:74 Code: 67 04 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 a4 e9 0f 67 04 00 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 RSP: 0018:ffffc9000f77f6d8 EFLAGS: 00050206 RAX: ffffffff84de2001 RBX: ffff8880547fe000 RCX: 0000000000000400 RDX: 0000000000000000 RSI: ffff8880547fec00 RDI: 00002000003fc000 RBP: ffffc9000f77f848 R08: ffff8880547fefff R09: 1ffff1100a8ffdff R10: dffffc0000000000 R11: ffffed100a8ffe00 R12: 1ffff92001eeffaf R13: 00002000003fb400 R14: ffffc9000f77fd88 R15: 0000000000001000 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] copy_to_user_iter lib/iov_iter.c:25 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:302 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] _copy_to_iter+0x255/0x1810 lib/iov_iter.c:197 copy_page_to_iter+0x23f/0x330 lib/iov_iter.c:374 copy_folio_to_iter include/linux/uio.h:204 [inline] filemap_read+0xa19/0x11e0 mm/filemap.c:2875 ocfs2_file_read_iter+0x3fc/0xae0 fs/ocfs2/file.c:2601 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x595/0xa80 fs/read_write.c:574 ksys_read+0x150/0x270 fs/read_write.c:716 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdbef19e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdbf00a2fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fdbef426090 RCX: 00007fdbef19e159 RDX: 00000000fffffeb1 RSI: 0000200000000400 RDI: 0000000000000005 RBP: 00007fdbef23506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdbef426128 R14: 00007fdbef426090 R15: 00007ffc2cf5d1d8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ocfs2_reserve_suballoc_bits+0x40c6/0x4850 fs/ocfs2/suballoc.c:922 Code: 00 00 e9 2b f1 ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c cc da ff ff 48 89 df e8 c5 e4 42 fe e9 bf da ff ff e8 bb 3d d1 fd 90 <0f> 0b 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 62 dc ff ff 4c 89 f7 RSP: 0018:ffffc9000f77dec0 EFLAGS: 00010246 RAX: ffffffff83f6a5b5 RBX: 00000000ffffffff RCX: 0000000000100000 RDX: ffffc90020001000 RSI: 00000000000fffff RDI: 0000000000100000 RBP: ffffc9000f77e390 R08: ffffffff907a627f R09: 1ffffffff20f4c4f R10: dffffc0000000000 R11: fffffbfff20f4c50 R12: ffff88801fc7dc60 R13: ffff88804390fe00 R14: dffffc0000000000 R15: fffff52001eefc04 FS: 00007fdbf00a36c0(0000) GS:ffff88808c2c6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b607562660 CR3: 0000000012b80000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 67 04 00 addr32 add $0x0,%al 3: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) a: 00 00 00 d: 0f 1f 00 nopl (%rax) 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 db je 0xfffffffe 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c5 jmp 0xffffffef * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: e9 0f 67 04 00 jmp 0x46740 31: 48 8b 06 mov (%rsi),%rax 34: 48 89 07 mov %rax,(%rdi) 37: 48 8d 47 08 lea 0x8(%rdi),%rax 3b: 48 83 e0 f8 and $0xfffffffffffffff8,%rax 3f: 48 rex.W