loop3: detected capacity change from 0 to 40 loop0: detected capacity change from 0 to 40 FAT-fs (loop1): bogus number of reserved sectors FAT-fs (loop1): Can't find a valid FAT filesystem loop7: detected capacity change from 0 to 264192 BUG: unable to handle page fault for address: ffffed100fffc000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 7ffd3067 P4D 7ffd3067 PUD 7ffd2067 PMD 7ffd1067 PTE 0 Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI CPU: 1 PID: 5940 Comm: syz-executor.0 Not tainted 6.1.0-rc3-next-20221101 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__memset+0x24/0x50 Code: 90 90 90 90 90 90 0f 1f 44 00 00 49 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 48 ab 89 d1 f3 aa 4c 89 c8 e9 0d d4 12 00 66 66 2e 0f 1f 84 00 RSP: 0018:ffff88801eaa70d0 EFLAGS: 00010016 RAX: 0000000000000000 RBX: ffff888008647100 RCX: 1ffffe21fe432a98 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffed100fffc000 RBP: ffff888008643500 R08: 0000000000000005 R09: ffffed10010c8e20 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888008647100 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000400 FS: 00007f2759c25700(0000) GS:ffff88806d100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffed100fffc000 CR3: 0000000016adc000 CR4: 0000000000350ee0 Call Trace: kasan_unpoison+0x23/0x60 remove_element+0x12e/0x1a0 mempool_alloc+0x22f/0x380 bio_alloc_bioset+0x39a/0x790 submit_bh_wbc+0x281/0x660 __bread_gfp+0x14f/0x340 fat12_ent_bread+0x144/0x430 fat_alloc_clusters+0x571/0xf40 fat_add_cluster+0x6d/0x110 fat_get_block+0x5c6/0x940 __block_write_begin_int+0x37c/0x13e0 block_write_begin+0xb5/0x460 cont_write_begin+0x4fa/0x710 fat_write_begin+0x85/0x190 cont_write_begin+0x5c4/0x710 fat_write_begin+0x85/0x190 generic_cont_expand_simple+0x118/0x210 fat_cont_expand+0x66/0x250 fat_setattr+0xe47/0x1660 notify_change+0xcca/0x1430 do_truncate+0x13f/0x210 do_sys_ftruncate+0x538/0x730 do_syscall_64+0x3b/0xa0 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f275c6afb19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2759c25188 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 00007f275c7c2f60 RCX: 00007f275c6afb19 RDX: 0000000000000000 RSI: 00000000000007b5 RDI: 0000000000000003 RBP: 00007f2759c251d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffcf17faf1f R14: 00007f2759c25300 R15: 0000000000022000 Modules linked in: CR2: ffffed100fffc000 ---[ end trace 0000000000000000 ]--- RIP: 0010:__memset+0x24/0x50 Code: 90 90 90 90 90 90 0f 1f 44 00 00 49 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 48 ab 89 d1 f3 aa 4c 89 c8 e9 0d d4 12 00 66 66 2e 0f 1f 84 00 RSP: 0018:ffff88801eaa70d0 EFLAGS: 00010016 RAX: 0000000000000000 RBX: ffff888008647100 RCX: 1ffffe21fe432a98 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffed100fffc000 RBP: ffff888008643500 R08: 0000000000000005 R09: ffffed10010c8e20 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888008647100 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000400 FS: 00007f2759c25700(0000) GS:ffff88806d100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffed100fffc000 CR3: 0000000016adc000 CR4: 0000000000350ee0 note: syz-executor.0[5940] exited with preempt_count 1 loop4: detected capacity change from 0 to 264192 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) b: 49 89 f9 mov %rdi,%r9 e: 48 89 d1 mov %rdx,%rcx 11: 83 e2 07 and $0x7,%edx 14: 48 c1 e9 03 shr $0x3,%rcx 18: 40 0f b6 f6 movzbl %sil,%esi 1c: 48 b8 01 01 01 01 01 movabs $0x101010101010101,%rax 23: 01 01 01 26: 48 0f af c6 imul %rsi,%rax * 2a: f3 48 ab rep stos %rax,%es:(%rdi) <-- trapping instruction 2d: 89 d1 mov %edx,%ecx 2f: f3 aa rep stos %al,%es:(%rdi) 31: 4c 89 c8 mov %r9,%rax 34: e9 0d d4 12 00 jmpq 0x12d446 39: 66 data16 3a: 66 data16 3b: 2e cs 3c: 0f .byte 0xf 3d: 1f (bad) 3e: 84 00 test %al,(%rax)