worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3f9/0x770 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:868! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 12975 Comm: syz.3.1278 Not tainted 6.16.0-rc2-syzkaller-00158-g5c8013ae2e86 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:867 Code: 02 c9 ff 4c 89 e7 48 c7 c6 60 37 94 8b e8 cb a2 10 00 90 0f 0b e8 83 02 c9 ff 4c 89 e7 48 c7 c6 40 2e 94 8b e8 b4 a2 10 00 90 <0f> 0b e8 6c 02 c9 ff 4c 89 e7 48 c7 c6 60 37 94 8b e8 9d a2 10 00 RSP: 0018:ffffc9000bbbee60 EFLAGS: 00010246 RAX: 29bb119100cf5900 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8da4c121 RDI: 00000000ffffffff RBP: ffffc9000bbbefc8 R08: ffffffff8fc232f7 R09: 1ffffffff1f8465e R10: dffffc0000000000 R11: fffffbfff1f8465f R12: ffffea00019cb340 R13: dffffc0000000000 R14: ffffea00019cb348 R15: 0000000000000001 FS: 00007f24c1a656c0(0000) GS:ffff888125b1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f027c72055a CR3: 0000000062c46000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: filemap_add_folio+0xd5/0x270 mm/filemap.c:969 ra_alloc_folio mm/readahead.c:448 [inline] page_cache_ra_order+0x74c/0xc70 mm/readahead.c:509 do_sync_mmap_readahead+0x4b5/0x5f0 mm/filemap.c:3271 filemap_fault+0x62a/0x1200 mm/filemap.c:3412 __do_fault+0x138/0x390 mm/memory.c:5189 do_shared_fault mm/memory.c:5674 [inline] do_fault mm/memory.c:5748 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6089 [inline] __handle_mm_fault+0x198b/0x5620 mm/memory.c:6232 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6401 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74 Code: cc cc cc 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 ff f6 03 00 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 RSP: 0018:ffffc9000bbbf7f8 EFLAGS: 00050206 RAX: ffffffff84c5b201 RBX: ffff8880556d2000 RCX: 0000000000000100 RDX: 0000000000000000 RSI: ffff8880556d2f00 RDI: 000020000004b000 RBP: ffffc9000bbbf948 R08: ffff8880556d2fff R09: 1ffff1100aada5ff R10: dffffc0000000000 R11: ffffed100aada600 R12: 1ffff92001777faf R13: 000020000004a100 R14: ffffc9000bbbfd88 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:300 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] _copy_to_iter+0x24c/0x16f0 lib/iov_iter.c:185 copy_page_to_iter+0x10c/0x1c0 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:204 [inline] filemap_read+0xa18/0x11a0 mm/filemap.c:2762 blkdev_read_iter+0x30a/0x440 block/fops.c:833 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x4cd/0x980 fs/read_write.c:572 ksys_read+0x145/0x250 fs/read_write.c:715 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f24c0b8e929 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:00007f24c1a65038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f24c0db5fa0 RCX: 00007f24c0b8e929 RDX: 00000000fffffe5a RSI: 0000200000000100 RDI: 0000000000000003 RBP: 00007f24c0c10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f24c0db5fa0 R15: 00007ffe7bdcb3b8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:867 Code: 02 c9 ff 4c 89 e7 48 c7 c6 60 37 94 8b e8 cb a2 10 00 90 0f 0b e8 83 02 c9 ff 4c 89 e7 48 c7 c6 40 2e 94 8b e8 b4 a2 10 00 90 <0f> 0b e8 6c 02 c9 ff 4c 89 e7 48 c7 c6 60 37 94 8b e8 9d a2 10 00 RSP: 0018:ffffc9000bbbee60 EFLAGS: 00010246 RAX: 29bb119100cf5900 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8da4c121 RDI: 00000000ffffffff RBP: ffffc9000bbbefc8 R08: ffffffff8fc232f7 R09: 1ffffffff1f8465e R10: dffffc0000000000 R11: fffffbfff1f8465f R12: ffffea00019cb340 R13: dffffc0000000000 R14: ffffea00019cb348 R15: 0000000000000001 FS: 00007f24c1a656c0(0000) GS:ffff888125b1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f98d83fe4e8 CR3: 0000000062c46000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: cc int3 1: cc int3 2: cc int3 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 ff f6 03 00 jmp 0x3f730 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