process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:463 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:867! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 3 UID: 0 PID: 11405 Comm: syz.2.1521 Not tainted syzkaller #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:__filemap_add_folio+0xf5b/0x11e0 mm/filemap.c:867 Code: 77 c8 ff 48 c7 c6 20 24 b9 8b 4c 89 ef e8 9d 28 11 00 90 0f 0b e8 a5 77 c8 ff 48 c7 c6 80 24 b9 8b 4c 89 ef e8 86 28 11 00 90 <0f> 0b e8 8e 77 c8 ff 90 0f 0b 90 e9 f2 fb ff ff e8 80 77 c8 ff 48 RSP: 0018:ffffc9000407f210 EFLAGS: 00010283 RAX: 000000000003af83 RBX: 0000000000000000 RCX: ffffc9000c803000 RDX: 0000000000080000 RSI: ffffffff81f3173a RDI: ffff888025cf2884 RBP: 0000000000112cc0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90ab6b97 R11: 0000000000000002 R12: 0000000000000002 R13: ffffea0000e6a4c0 R14: 0000000000000000 R15: 000000000002c928 FS: 00007f3f10fca6c0(0000) GS:ffff8880d69b5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000002c0 CR3: 0000000021be8000 CR4: 0000000000352ef0 Call Trace: filemap_add_folio+0x10e/0x220 mm/filemap.c:969 ra_alloc_folio mm/readahead.c:448 [inline] page_cache_ra_order+0x5a7/0xd70 mm/readahead.c:506 do_sync_mmap_readahead mm/filemap.c:3304 [inline] filemap_fault+0x152e/0x2930 mm/filemap.c:3445 __do_fault+0x10d/0x490 mm/memory.c:5152 do_read_fault mm/memory.c:5573 [inline] do_fault mm/memory.c:5707 [inline] do_pte_missing+0xf50/0x3ba0 mm/memory.c:4234 handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195 handle_mm_fault+0x589/0xd10 mm/memory.c:6364 do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] RIP: 0010:raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] RIP: 0010:_inline_copy_from_user include/linux/uaccess.h:178 [inline] RIP: 0010:_copy_from_user+0x93/0xd0 lib/usercopy.c:18 Code: db d7 fc 89 ee 4c 89 ef 48 b8 00 f0 ff ff ff 7f 00 00 48 39 c3 48 0f 47 d8 e8 e9 43 3e fd 0f 01 cb 4c 89 ef 48 89 de 48 89 e9 a4 0f 1f 00 49 89 cc 48 89 cb 0f 01 ca 31 ff 48 89 ce e8 f5 d6 RSP: 0018:ffffc9000407fa00 EFLAGS: 00050246 RAX: 0000000000000001 RBX: 00002000000002c0 RCX: 0000000000000038 RDX: fffff5200080ff50 RSI: 00002000000002c0 RDI: ffffc9000407fa48 RBP: 0000000000000038 R08: 0000000000000001 R09: fffff5200080ff4f R10: ffffc9000407fa7f R11: 0000000000000000 R12: 0000000000000000 R13: ffffc9000407fa48 R14: ffffc9000407fb40 R15: ffffc9000407fa48 copy_from_user include/linux/uaccess.h:212 [inline] copy_msghdr_from_user+0x98/0x160 net/socket.c:2544 sendmsg_copy_msghdr net/socket.c:2645 [inline] ___sys_sendmsg+0xfe/0x1d0 net/socket.c:2664 __sys_sendmmsg+0x200/0x420 net/socket.c:2757 __do_sys_sendmmsg net/socket.c:2784 [inline] __se_sys_sendmmsg net/socket.c:2781 [inline] __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2781 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3f1018ebe9 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:00007f3f10fca038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f3f103c6090 RCX: 00007f3f1018ebe9 RDX: 040000000000009f RSI: 00002000000002c0 RDI: 0000000000000004 RBP: 00007f3f10211e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3f103c6128 R14: 00007f3f103c6090 R15: 00007fff5e68a618 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0xf5b/0x11e0 mm/filemap.c:867 Code: 77 c8 ff 48 c7 c6 20 24 b9 8b 4c 89 ef e8 9d 28 11 00 90 0f 0b e8 a5 77 c8 ff 48 c7 c6 80 24 b9 8b 4c 89 ef e8 86 28 11 00 90 <0f> 0b e8 8e 77 c8 ff 90 0f 0b 90 e9 f2 fb ff ff e8 80 77 c8 ff 48 RSP: 0018:ffffc9000407f210 EFLAGS: 00010283 RAX: 000000000003af83 RBX: 0000000000000000 RCX: ffffc9000c803000 RDX: 0000000000080000 RSI: ffffffff81f3173a RDI: ffff888025cf2884 RBP: 0000000000112cc0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90ab6b97 R11: 0000000000000002 R12: 0000000000000002 R13: ffffea0000e6a4c0 R14: 0000000000000000 R15: 000000000002c928 FS: 00007f3f10fca6c0(0000) GS:ffff8880d69b5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000002c0 CR3: 0000000021be8000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: db d7 fcmovnbe %st(7),%st 2: fc cld 3: 89 ee mov %ebp,%esi 5: 4c 89 ef mov %r13,%rdi 8: 48 b8 00 f0 ff ff ff movabs $0x7ffffffff000,%rax f: 7f 00 00 12: 48 39 c3 cmp %rax,%rbx 15: 48 0f 47 d8 cmova %rax,%rbx 19: e8 e9 43 3e fd call 0xfd3e4407 1e: 0f 01 cb stac 21: 4c 89 ef mov %r13,%rdi 24: 48 89 de mov %rbx,%rsi 27: 48 89 e9 mov %rbp,%rcx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 0f 1f 00 nopl (%rax) 2f: 49 89 cc mov %rcx,%r12 32: 48 89 cb mov %rcx,%rbx 35: 0f 01 ca clac 38: 31 ff xor %edi,%edi 3a: 48 89 ce mov %rcx,%rsi 3d: e8 .byte 0xe8 3e: f5 cmc 3f: d6 (bad)