------------[ cut here ]------------ kernel BUG at ./include/linux/pagemap.h:1408! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5322 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~bpo12+1 04/01/2014 RIP: 0010:__readahead_folio include/linux/pagemap.h:1408 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1434 [inline] RIP: 0010:mpage_readahead+0x765/0x790 fs/mpage.c:367 Code: c6 c0 2c 7a 8b e8 4b b9 dc fe 90 0f 0b e8 d3 e0 74 ff 4c 89 ff 48 c7 c6 a0 2b 7a 8b e8 34 b9 dc fe 90 0f 0b e8 bc e0 74 ff 90 <0f> 0b e8 b4 e0 74 ff 4c 89 ff 48 c7 c6 c0 2c 7a 8b e8 15 b9 dc fe RSP: 0018:ffffc9000d42f000 EFLAGS: 00010287 RAX: ffffffff824b3574 RBX: 0000000000000004 RCX: 0000000000100000 RDX: ffffc9000e02a000 RSI: 0000000000083b20 RDI: 0000000000083b21 RBP: ffffc9000d42f1f0 R08: ffffea0001450907 R09: 1ffffd400028a120 R10: dffffc0000000000 R11: fffff9400028a121 R12: ffffc9000d42f468 R13: dffffc0000000000 R14: 0000000000000001 R15: ffffc9000d42f480 FS: 00007f35876a96c0(0000) GS:ffff88808d732000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3586773360 CR3: 000000000b4ee000 CR4: 0000000000352ef0 Call Trace: read_pages+0x17a/0x580 mm/readahead.c:163 page_cache_ra_unbounded+0x3ea/0x9a0 mm/readahead.c:269 do_sync_mmap_readahead+0x25e/0x7a0 mm/filemap.c:-1 filemap_fault+0x6b9/0x12b0 mm/filemap.c:3489 __do_fault+0x138/0x390 mm/memory.c:5280 do_read_fault mm/memory.c:5698 [inline] do_fault mm/memory.c:5832 [inline] do_pte_missing mm/memory.c:4361 [inline] handle_pte_fault mm/memory.c:6177 [inline] __handle_mm_fault+0x35e3/0x5400 mm/memory.c:6318 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6487 do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:fault_in_readable+0x8e/0x130 mm/gup.c:2161 Code: a9 00 00 00 0f 01 cb 0f ae e8 4d 85 f6 40 0f 95 c5 4c 89 ff 4c 89 f6 e8 80 0a b5 ff 4d 39 f7 0f 97 c0 40 84 c5 74 43 4d 89 f5 <41> 8a 45 00 88 44 24 07 49 81 e5 00 f0 ff ff 4d 8d a5 00 10 00 00 RSP: 0018:ffffc9000d42faa8 EFLAGS: 00050202 RAX: ffffffff820b0e01 RBX: 0000000000000040 RCX: ffff88803e442480 RDX: 0000000000000002 RSI: 0000200000300000 RDI: 0000200000300040 RBP: dffffc0000000001 R08: ffff88803e442480 R09: 0000000000000002 R10: 0000000000000001 R11: 0000000000000002 R12: 00007ffffffff000 R13: 0000200000300000 R14: 0000200000300000 R15: 0000200000300040 fault_in_iov_iter_readable+0x1b4/0x2f0 lib/iov_iter.c:94 generic_perform_write+0x7b5/0x900 mm/filemap.c:4291 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3464 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f358678f6c9 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:00007f35876a9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f35869e5fa0 RCX: 00007f358678f6c9 RDX: 000000000208e24b RSI: 0000200000000040 RDI: 0000000000000005 RBP: 00007f3586811f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f35869e6038 R14: 00007f35869e5fa0 R15: 00007ffcbc953048 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__readahead_folio include/linux/pagemap.h:1408 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1434 [inline] RIP: 0010:mpage_readahead+0x765/0x790 fs/mpage.c:367 Code: c6 c0 2c 7a 8b e8 4b b9 dc fe 90 0f 0b e8 d3 e0 74 ff 4c 89 ff 48 c7 c6 a0 2b 7a 8b e8 34 b9 dc fe 90 0f 0b e8 bc e0 74 ff 90 <0f> 0b e8 b4 e0 74 ff 4c 89 ff 48 c7 c6 c0 2c 7a 8b e8 15 b9 dc fe RSP: 0018:ffffc9000d42f000 EFLAGS: 00010287 RAX: ffffffff824b3574 RBX: 0000000000000004 RCX: 0000000000100000 RDX: ffffc9000e02a000 RSI: 0000000000083b20 RDI: 0000000000083b21 RBP: ffffc9000d42f1f0 R08: ffffea0001450907 R09: 1ffffd400028a120 R10: dffffc0000000000 R11: fffff9400028a121 R12: ffffc9000d42f468 R13: dffffc0000000000 R14: 0000000000000001 R15: ffffc9000d42f480 FS: 00007f35876a96c0(0000) GS:ffff88808d732000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8605d909c0 CR3: 000000000b4ee000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: a9 00 00 00 0f test $0xf000000,%eax 5: 01 cb add %ecx,%ebx 7: 0f ae e8 lfence a: 4d 85 f6 test %r14,%r14 d: 40 0f 95 c5 setne %bpl 11: 4c 89 ff mov %r15,%rdi 14: 4c 89 f6 mov %r14,%rsi 17: e8 80 0a b5 ff call 0xffb50a9c 1c: 4d 39 f7 cmp %r14,%r15 1f: 0f 97 c0 seta %al 22: 40 84 c5 test %al,%bpl 25: 74 43 je 0x6a 27: 4d 89 f5 mov %r14,%r13 * 2a: 41 8a 45 00 mov 0x0(%r13),%al <-- trapping instruction 2e: 88 44 24 07 mov %al,0x7(%rsp) 32: 49 81 e5 00 f0 ff ff and $0xfffffffffffff000,%r13 39: 4d 8d a5 00 10 00 00 lea 0x1000(%r13),%r12