syzbot


BUG: unable to handle kernel paging request in handle_softirqs (2)

Status: moderation: reported on 2025/06/21 08:46
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+35be979c14fae067a5a1@syzkaller.appspotmail.com
First crash: 4d06h, last: 4d06h
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: unable to handle kernel paging request in handle_softirqs bpf bcachefs syz 1 112d 108d 0/29 auto-obsoleted due to no activity on 2025/06/09 05:50

Sample crash report:
BUG: unable to handle page fault for address: ffffffff00000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD df3d067 P4D df3d067 PUD 0 
Oops: Oops: 0010 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6979 Comm: syz.5.236 Not tainted 6.16.0-rc2-syzkaller-00024-g9afe652958c3 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:0xffffffff00000000
Code: Unable to access opcode bytes at 0xfffffffeffffffd6.
RSP: 0018:ffffc90000007bd8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8880693c5000 RCX: c08684cf69579d00
RDX: 0000000000000001 RSI: ffffffff8db5a486 RDI: ffff8880693c5000
RBP: ffffc90000007e30 R08: 0000000000000000 R09: ffffffff81a8b814
R10: dffffc0000000000 R11: ffffffff00000000 R12: ffffffff00000000
R13: ffffffff81a8b814 R14: 1ffff1100d278a01 R15: ffff8880693c5008
FS:  00007ffbe90446c0(0000) GS:ffff888125c85000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffeffffffd6 CR3: 00000000316b4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 handle_softirqs+0x286/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_is_held_type+0x0/0x190 kernel/locking/lockdep.c:5928
Code: ca 24 f6 90 0f 0b 90 90 90 eb b5 e8 1a fc ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 48 8b 05
RSP: 0018:ffffc9001c0b7508 EFLAGS: 00000292
RAX: ffffffff81f730c8 RBX: dffffc0000000000 RCX: 0000000000000002
RDX: ffff88802a678000 RSI: 00000000ffffffff RDI: ffff888029ff10d0
RBP: ffffea00014e4040 R08: ffffea00014e4037 R09: 1ffffd400029c806
R10: dffffc0000000000 R11: fffff9400029c807 R12: 1ffff92003816ee1
R13: ffffc9001c0b7708 R14: 0000000000000001 R15: ffff888029ff10d0
 lock_is_held include/linux/lockdep.h:249 [inline]
 xa_entry include/linux/xarray.h:1226 [inline]
 xas_next_entry+0x1de/0x3d0 include/linux/xarray.h:1731
 next_uptodate_folio+0x32/0x5d0 mm/filemap.c:3562
 filemap_map_pages+0x1025/0x1740 mm/filemap.c:3755
 do_fault_around mm/memory.c:5568 [inline]
 do_read_fault mm/memory.c:5601 [inline]
 do_fault mm/memory.c:5744 [inline]
 do_pte_missing mm/memory.c:4251 [inline]
 handle_pte_fault mm/memory.c:6089 [inline]
 __handle_mm_fault+0x368a/0x5620 mm/memory.c:6232
 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6401
 faultin_page mm/gup.c:1186 [inline]
 __get_user_pages+0x1af4/0x30b0 mm/gup.c:1488
 populate_vma_page_range+0x26b/0x340 mm/gup.c:1926
 __mm_populate+0x24c/0x380 mm/gup.c:2029
 mm_populate include/linux/mm.h:3348 [inline]
 vm_mmap_pgoff+0x3f0/0x4c0 mm/util.c:584
 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: 0033:0x7ffbe818e929
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:00007ffbe9044038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ffbe83b6160 RCX: 00007ffbe818e929
RDX: 8cd94b934ec872d5 RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007ffbe8210b39 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007ffbe83b6160 R15: 00007fff4e326698
 </TASK>
Modules linked in:
CR2: ffffffff00000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0xffffffff00000000
Code: Unable to access opcode bytes at 0xfffffffeffffffd6.
RSP: 0018:ffffc90000007bd8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8880693c5000 RCX: c08684cf69579d00
RDX: 0000000000000001 RSI: ffffffff8db5a486 RDI: ffff8880693c5000
RBP: ffffc90000007e30 R08: 0000000000000000 R09: ffffffff81a8b814
R10: dffffc0000000000 R11: ffffffff00000000 R12: ffffffff00000000
R13: ffffffff81a8b814 R14: 1ffff1100d278a01 R15: ffff8880693c5008
FS:  00007ffbe90446c0(0000) GS:ffff888125c85000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffeffffffd6 CR3: 00000000316b4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	ca 24 f6             	lret   $0xf624
   3:	90                   	nop
   4:	0f 0b                	ud2
   6:	90                   	nop
   7:	90                   	nop
   8:	90                   	nop
   9:	eb b5                	jmp    0xffffffc0
   b:	e8 1a fc ff ff       	call   0xfffffc2a
  10:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  17:	00 00 00
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	90                   	nop
  22:	90                   	nop
  23:	90                   	nop
  24:	90                   	nop
  25:	90                   	nop
  26:	90                   	nop
  27:	90                   	nop
  28:	90                   	nop
  29:	90                   	nop
* 2a:	f3 0f 1e fa          	endbr64 <-- trapping instruction
  2e:	55                   	push   %rbp
  2f:	41 57                	push   %r15
  31:	41 56                	push   %r14
  33:	41 55                	push   %r13
  35:	41 54                	push   %r12
  37:	53                   	push   %rbx
  38:	48 83 ec 10          	sub    $0x10,%rsp
  3c:	65                   	gs
  3d:	48                   	rex.W
  3e:	8b                   	.byte 0x8b
  3f:	05                   	.byte 0x5

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/17 08:44 upstream 9afe652958c3 cfebc887 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: unable to handle kernel paging request in handle_softirqs
* Struck through repros no longer work on HEAD.