arch_do_signal_or_restart+0x8f/0x7c0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x85/0x130 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/filemap.c:3519! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 2 UID: 0 PID: 6258 Comm: syz.2.66 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_fault+0x1971/0x29a0 mm/filemap.c:3519 Code: 77 2f 00 e9 a6 eb ff ff 4c 89 ef e8 d9 77 2f 00 e9 4a f2 ff ff e8 4f d4 c6 ff 48 c7 c6 c0 72 99 8b 48 89 df e8 e0 f3 10 00 90 <0f> 0b e8 38 d4 c6 ff 48 c7 c6 e0 68 99 8b 48 89 df e8 c9 f3 10 00 RSP: 0018:ffffc90004baf420 EFLAGS: 00010287 RAX: 0000000000020028 RBX: ffffea0001800080 RCX: ffffc90007692000 RDX: 0000000000080000 RSI: ffffffff81f613a0 RDI: ffff88803bf8a904 RBP: ffffc90004baf6f8 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90821dd7 R11: 1ffffffff1c79ec9 R12: ffff8881049b1f80 R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f3e0b59b6c0(0000) GS:ffff8880d6c05000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000005a830000 CR4: 0000000000352ef0 Call Trace: __do_fault+0x10d/0x490 mm/memory.c:5281 do_read_fault mm/memory.c:5716 [inline] do_fault mm/memory.c:5850 [inline] do_pte_missing+0xf4a/0x3ba0 mm/memory.c:4362 handle_pte_fault mm/memory.c:6195 [inline] __handle_mm_fault+0x1556/0x2aa0 mm/memory.c:6336 handle_mm_fault+0x589/0xd10 mm/memory.c:6505 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+0x64/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:fault_in_readable+0x135/0x1d0 mm/gup.c:2161 Code: 21 ce b5 ff 48 85 db 0f 84 9c 00 00 00 e8 a3 d2 b5 ff 48 89 de 48 89 ef e8 48 cd b5 ff 48 39 eb 73 1d e8 8e d2 b5 ff 45 89 f7 <8a> 03 31 ff 44 89 fe 88 44 24 28 e8 bb cd b5 ff 45 85 ff 74 a8 e8 RSP: 0018:ffffc90004baf998 EFLAGS: 00050283 RAX: 000000000000071f RBX: 00002000000010c0 RCX: ffffc90007692000 RDX: 0000000000080000 RSI: ffffffff82071552 RDI: 0000000000000006 RBP: 00002000000020c0 R08: 0000000000000006 R09: 00002000000010c0 R10: 00002000000020c0 R11: 0000000000000001 R12: 00002000000010c0 R13: 0000000000001000 R14: 0000000000000000 R15: 0000000000000000 fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94 iomap_write_iter fs/iomap/buffered-io.c:985 [inline] iomap_file_buffered_write+0x441/0xac0 fs/iomap/buffered-io.c:1071 fuse_cache_write_iter fs/fuse/file.c:1460 [inline] fuse_file_write_iter+0x6f0/0x990 fs/fuse/file.c:1783 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d3/0x11d0 fs/read_write.c:686 ksys_write+0x1f8/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3e0a78f7c9 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:00007f3e0b59b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f3e0a9e5fa0 RCX: 00007f3e0a78f7c9 RDX: 00000000fffffdef RSI: 00002000000000c0 RDI: 0000000000000006 RBP: 00007f3e0a813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3e0a9e6038 R14: 00007f3e0a9e5fa0 R15: 00007ffe1c71a248 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:filemap_fault+0x1971/0x29a0 mm/filemap.c:3519 Code: 77 2f 00 e9 a6 eb ff ff 4c 89 ef e8 d9 77 2f 00 e9 4a f2 ff ff e8 4f d4 c6 ff 48 c7 c6 c0 72 99 8b 48 89 df e8 e0 f3 10 00 90 <0f> 0b e8 38 d4 c6 ff 48 c7 c6 e0 68 99 8b 48 89 df e8 c9 f3 10 00 RSP: 0018:ffffc90004baf420 EFLAGS: 00010287 RAX: 0000000000020028 RBX: ffffea0001800080 RCX: ffffc90007692000 RDX: 0000000000080000 RSI: ffffffff81f613a0 RDI: ffff88803bf8a904 RBP: ffffc90004baf6f8 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90821dd7 R11: 1ffffffff1c79ec9 R12: ffff8881049b1f80 R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f3e0b59b6c0(0000) GS:ffff8880d6c05000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000005a830000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 21 ce and %ecx,%esi 2: b5 ff mov $0xff,%ch 4: 48 85 db test %rbx,%rbx 7: 0f 84 9c 00 00 00 je 0xa9 d: e8 a3 d2 b5 ff call 0xffb5d2b5 12: 48 89 de mov %rbx,%rsi 15: 48 89 ef mov %rbp,%rdi 18: e8 48 cd b5 ff call 0xffb5cd65 1d: 48 39 eb cmp %rbp,%rbx 20: 73 1d jae 0x3f 22: e8 8e d2 b5 ff call 0xffb5d2b5 27: 45 89 f7 mov %r14d,%r15d * 2a: 8a 03 mov (%rbx),%al <-- trapping instruction 2c: 31 ff xor %edi,%edi 2e: 44 89 fe mov %r15d,%esi 31: 88 44 24 28 mov %al,0x28(%rsp) 35: e8 bb cd b5 ff call 0xffb5cdf5 3a: 45 85 ff test %r15d,%r15d 3d: 74 a8 je 0xffffffe7 3f: e8 .byte 0xe8