syzbot


uvm_fault: db_enter (3)

Status: closed as invalid on 2022/06/11 05:12
Reported-by: syzbot+81935104ab719ec7e2db@syzkaller.appspotmail.com
First crash: 775d, last: 775d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd uvm_fault: db_enter (5) 70 21m 318d 0/3 upstream: reported on 2023/09/11 08:12
openbsd uvm_fault: db_enter (2) 1 806d 806d 0/3 closed as invalid on 2022/05/11 17:28
openbsd uvm_fault: db_enter 43 1464d 1518d 0/3 closed as dup on 2020/05/30 07:36
openbsd uvm_fault: db_enter (4) 30 420d 761d 0/3 auto-obsoleted due to no activity on 2023/08/30 12:34

Sample crash report:
uvm_fault(fffffd806ee67738,c001d8e000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602
upageflttrap(ffff8000212101a0,c001d8e060) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
usertrap(ffff8000212101a0) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0xc002b1f658, count: -14
ddb{0}> machine ddbcpu 1
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
witness_checkorder(fffffd8075b680a0,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd8075b680a0,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter(fffffd8075b68090,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
rrw_enter(fffffd8075b68090,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:465
VOP_LOCK(fffffd8068faa390,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:534
vn_lock(fffffd8068faa390,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_io(fffffd807db20248,ffff8000274e3270,1,2b,1) at uvn_io+0x338 sys/uvm/uvm_vnode.c:1236
uvm_pager_put(fffffd807db20248,fffffd8008109e20,ffff8000274e3308,ffff8000274e3348,2b,0,cb4ff3673f0aeca7) at uvm_pager_put+0x137 sys/uvm/uvm_pager.c:523
uvn_flush(fffffd807db20248,0,3000,b) at uvn_flush+0x532 sys/uvm/uvm_vnode.c:723
uvm_map_clean(fffffd807d067a10,20000000,20004000,b) at uvm_map_clean+0x72b sys/uvm/uvm_map.c:4788
syscall(ffff8000274e3540) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000274e3540) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x47ad5478350, count: -12

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/06/10 19:49 openbsd 8bcd09c7700c 0d5abf15 .config console log report ci-openbsd-multicore uvm_fault: db_enter
* Struck through repros no longer work on HEAD.