handle_softirqs+0x226/0x860 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:859! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 6962 Comm: syz.3.239 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026 RIP: 0010:__filemap_add_folio+0x128c/0x1400 mm/filemap.c:858 Code: ff 4c 89 f7 48 c7 c6 c0 0b 19 8c e8 3e 5d 1f ff 90 0f 0b e8 d6 49 bf ff 48 8b 7c 24 20 48 c7 c6 80 00 19 8c e8 25 5d 1f ff 90 <0f> 0b e8 bd 49 bf ff 4c 89 f7 48 c7 c6 c0 0b 19 8c e8 0e 5d 1f ff RSP: 0018:ffffc90005357240 EFLAGS: 00010246 RAX: cd26c37201783100 RBX: 0000000000000000 RCX: 0000000000000046 RDX: ffffc9000faa4000 RSI: ffffffff8e69f2bd RDI: ffff88803490be80 RBP: ffffc900053573d8 R08: ffff8880b8724713 R09: 1ffff110170e48e2 R10: dffffc0000000000 R11: ffffed10170e48e3 R12: dffffc0000000000 R13: ffff88802396f040 R14: 0000000000000002 R15: ffff88802396f158 FS: 00007f07990ee6c0(0000) GS:ffff888124dc7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000007478 CR3: 0000000074a72000 CR4: 0000000000350ef0 Call Trace: filemap_add_folio+0x251/0x4e0 mm/filemap.c:972 ra_alloc_folio mm/readahead.c:470 [inline] page_cache_ra_order+0x6d1/0xee0 mm/readahead.c:535 do_sync_mmap_readahead+0x75e/0x990 mm/filemap.c:3443 filemap_fault+0x7d9/0x13b0 mm/filemap.c:3597 __do_fault+0x138/0x2a0 mm/memory.c:5565 do_shared_fault mm/memory.c:6064 [inline] do_fault mm/memory.c:6138 [inline] do_pte_missing+0x684/0x34b0 mm/memory.c:4700 handle_pte_fault mm/memory.c:6558 [inline] __handle_mm_fault mm/memory.c:6707 [inline] handle_mm_fault+0x1a53/0x3750 mm/memory.c:6876 do_user_addr_fault+0x746/0x1340 arch/x86/mm/fault.c:1394 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0010:__put_user_4+0xd/0x30 arch/x86/lib/putuser.S:94 Code: 66 89 01 31 c9 0f 01 ca e9 9b ed 29 f5 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca e9 72 ed 29 f5 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90005357c98 EFLAGS: 00050206 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000200000007478 RDX: 00000000085bb8bd RSI: ffffffff8e69f2bd RDI: ffffffff8c6dad80 RBP: ffffc90005357eb0 R08: ffffffff821ef56f R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff20f4c50 R12: 1ffff92000a6af9c R13: 0000000000040000 R14: 0000200000007440 R15: 0000000000000180 __sys_sendmmsg+0x2a7/0x4d0 net/socket.c:2861 __do_sys_sendmmsg net/socket.c:2883 [inline] __se_sys_sendmmsg net/socket.c:2880 [inline] __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2880 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f079819e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f07990ee028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f0798426090 RCX: 00007f079819e159 RDX: 0400000000000181 RSI: 00002000000030c0 RDI: 0000000000000006 RBP: 00007f079823506b R08: 0000000000000000 R09: 0000000000000000 R10: 9200000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0798426128 R14: 00007f0798426090 R15: 00007ffe029a48d8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0x128c/0x1400 mm/filemap.c:858 Code: ff 4c 89 f7 48 c7 c6 c0 0b 19 8c e8 3e 5d 1f ff 90 0f 0b e8 d6 49 bf ff 48 8b 7c 24 20 48 c7 c6 80 00 19 8c e8 25 5d 1f ff 90 <0f> 0b e8 bd 49 bf ff 4c 89 f7 48 c7 c6 c0 0b 19 8c e8 0e 5d 1f ff RSP: 0018:ffffc90005357240 EFLAGS: 00010246 RAX: cd26c37201783100 RBX: 0000000000000000 RCX: 0000000000000046 RDX: ffffc9000faa4000 RSI: ffffffff8e69f2bd RDI: ffff88803490be80 RBP: ffffc900053573d8 R08: ffff8880b8724713 R09: 1ffff110170e48e2 R10: dffffc0000000000 R11: ffffed10170e48e3 R12: dffffc0000000000 R13: ffff88802396f040 R14: 0000000000000002 R15: ffff88802396f158 FS: 00007f07990ee6c0(0000) GS:ffff888124dc7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff3a81f000 CR3: 0000000074a72000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 66 89 01 mov %ax,(%rcx) 3: 31 c9 xor %ecx,%ecx 5: 0f 01 ca clac 8: e9 9b ed 29 f5 jmp 0xf529eda8 d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 48 89 cb mov %rcx,%rbx 20: 48 c1 fb 3f sar $0x3f,%rbx 24: 48 09 d9 or %rbx,%rcx 27: 0f 01 cb stac * 2a: 89 01 mov %eax,(%rcx) <-- trapping instruction 2c: 31 c9 xor %ecx,%ecx 2e: 0f 01 ca clac 31: e9 72 ed 29 f5 jmp 0xf529eda8 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop