syzbot


KASAN: user-memory-access Write in do_profile_hits (2)

Status: auto-obsoleted due to no activity on 2023/02/07 02:46
Reported-by: syzbot+7644c4ee8857e8fd1bfd@syzkaller.appspotmail.com
First crash: 786d, last: 786d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 KASAN: user-memory-access Write in do_profile_hits 2 1002d 1009d 0/1 auto-closed as invalid on 2022/07/05 13:55

Sample crash report:
loop5: p28 start 1728127931 is beyond EOD, truncated
loop5: p29 start 3935902735 is beyond EOD, truncated
==================================================================
BUG: KASAN: user-memory-access in atomic_add include/asm-generic/atomic-instrumented.h:143 [inline]
BUG: KASAN: user-memory-access in do_profile_hits.constprop.0+0x2ae/0x610 kernel/profile.c:324
Write of size 4 at addr 00000006ffffe010 by task syz-executor.0/7828

CPU: 1 PID: 7828 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 kasan_report_error.cold+0x15b/0x1b9 mm/kasan/report.c:352
 kasan_report+0x8f/0xa0 mm/kasan/report.c:412
 atomic_add include/asm-generic/atomic-instrumented.h:143 [inline]
 do_profile_hits.constprop.0+0x2ae/0x610 kernel/profile.c:324
 profile_hits kernel/profile.c:398 [inline]
 profile_hit include/linux/profile.h:64 [inline]
 profile_tick+0xd7/0xf0 kernel/profile.c:408
 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278
 __run_hrtimer kernel/time/hrtimer.c:1465 [inline]
 __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1527
 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:192
Code: c0 98 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 01 31 d8 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 26 1b 28 f9 65 8b 05 9f 8d e8 77 85 c0 74 02 5d
RSP: 0018:ffff88803ee37b58 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13e3053 RBX: ffff8880af631230 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff88809294cbc4
RBP: ffffffff89e09140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89f56fc0
R13: ffff8880af631230 R14: dffffc0000000000 R15: ffff88809ad1de50
 spin_unlock_irq include/linux/spinlock.h:379 [inline]
 alloc_pid+0x507/0x8f0 kernel/pid.c:226
 copy_process.part.0+0x3bc0/0x8260 kernel/fork.c:1927
 copy_process kernel/fork.c:1710 [inline]
 _do_fork+0x22f/0xf30 kernel/fork.c:2219
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f258d13c9d1
Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00
RSP: 002b:00007ffea98ece58 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f258baaf700 RCX: 00007f258d13c9d1
RDX: 00007f258baaf9d0 RSI: 00007f258baaf2f0 RDI: 00000000003d0f00
RBP: 00007ffea98ed0a0 R08: 00007f258baaf700 R09: 00007f258baaf700
R10: 00007f258baaf9d0 R11: 0000000000000206 R12: 00007ffea98ecf0e
R13: 00007ffea98ecf0f R14: 00007f258baaf300 R15: 0000000000022000
==================================================================
----------------
Code disassembly (best guess), 5 bytes skipped:
   0:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
   7:	fc ff df
   a:	48 c1 e8 03          	shr    $0x3,%rax
   e:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1)
  12:	75 31                	jne    0x45
  14:	48 83 3d 01 31 d8 01 	cmpq   $0x0,0x1d83101(%rip)        # 0x1d8311d
  1b:	00
  1c:	74 25                	je     0x43
  1e:	fb                   	sti
  1f:	66 0f 1f 44 00 00    	nopw   0x0(%rax,%rax,1)
* 25:	bf 01 00 00 00       	mov    $0x1,%edi <-- trapping instruction
  2a:	e8 26 1b 28 f9       	callq  0xf9281b55
  2f:	65 8b 05 9f 8d e8 77 	mov    %gs:0x77e88d9f(%rip),%eax        # 0x77e88dd5
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5d                   	pop    %rbp

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/10 02:45 linux-4.19.y 3f8a27f9e27b aea5da89 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: user-memory-access Write in do_profile_hits
* Struck through repros no longer work on HEAD.