syzbot


uvm_fault: db_enter (6)

Status: upstream: reported on 2025/02/04 07:12
Reported-by: syzbot+823760782418600844b6@syzkaller.appspotmail.com
First crash: 379d, last: 5d17h
Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd uvm_fault: db_enter (5) -1 368 455d 891d 0/3 auto-obsoleted due to no activity on 2025/01/09 05:55
openbsd uvm_fault: db_enter (2) -1 1 1379d 1379d 0/3 closed as invalid on 2022/05/11 17:28
openbsd uvm_fault: db_enter -1 43 2038d 2092d 0/3 closed as dup on 2020/05/30 07:36
openbsd uvm_fault: db_enter (4) -1 30 993d 1335d 0/3 auto-obsoleted due to no activity on 2023/08/30 12:34
openbsd uvm_fault: db_enter (3) -1 1 1349d 1349d 0/3 closed as invalid on 2022/06/11 05:12

Sample crash report:
uvm_fault(fffffd806bfbd9a0,77333301000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650
upageflttrap(ffff80003c44d490,77333301000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003c44d490) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x76662316d290, count: -11
ddb{0}> machine ddbcpu 1
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
witness_checkorder(fffffd806e854908,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffd806e8548f0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
rrw_enter(fffffd806e8548f0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd806e857558,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffd806e857558,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vn_closefile(fffffd805d9bac60,ffff8000fffef240) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd805d9bac60,ffff8000fffef240) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615
fdrop(fffffd805d9bac60,ffff8000fffef240) at fdrop+0x121 sys/kern/kern_descrip.c:1280
knote_drop(fffffd805fcad448,ffff8000fffef240) at knote_drop+0x1a1 sys/kern/kern_event.c:2296
knote_remove(ffff8000fffef240,fffffd806f55ab60,fffffd806f55abf0,3,0) at knote_remove+0x215 sys/kern/kern_event.c:-1
knote_fdclose(ffff8000fffef240,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203
fdrelease(ffff8000fffef240,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:760
syscall(ffff80003c484fb0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c484fb0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x844eb64d720, count: -14

Crashes (576):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/13 11:09 openbsd 7d8bc7d2b639 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/02/12 01:38 openbsd fad87c8e2325 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/02/07 23:09 openbsd 6a5ee414a02d 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/02/06 07:58 openbsd fb820f9a8913 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/02/06 02:27 openbsd 46e16b2b21c5 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/02/05 15:09 openbsd f4cdf487c26e 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/02/04 19:19 openbsd 3e29b976dc48 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/02/04 11:04 openbsd 75991a0e19ad 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/02/03 19:49 openbsd 72466e384590 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/02/02 12:16 openbsd 28dc9acc561e 018ebef2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/02/02 04:25 openbsd 28dc9acc561e 6b8752f2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/02/01 22:49 openbsd 455fdbe5e703 6b8752f2 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/30 14:02 openbsd dfcd5193b8f0 ae7dc18c .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/27 17:51 openbsd 4b649cda673b 71ad32b1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/26 08:27 openbsd 401b985036af 55756628 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/26 02:51 openbsd 401b985036af 55756628 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/26 00:05 openbsd 401b985036af 55756628 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/25 17:05 openbsd f99cc216b56b 40acda8a .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/25 07:34 openbsd 12762e433761 40acda8a .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/23 02:32 openbsd 9e4d3748fbc0 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/18 17:32 openbsd 4409e1965d65 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/17 23:45 openbsd f5df22e61f89 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/17 07:00 openbsd 5569d0f08b09 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/15 04:06 openbsd ac9e191703f1 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/14 05:57 openbsd 3d903ed5427e 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/07 08:49 openbsd c7117ed52e15 15f6fd08 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/06 19:37 openbsd 4459f914e6b0 15f6fd08 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/06 16:40 openbsd 4459f914e6b0 15f6fd08 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/05 13:58 openbsd 97968167a1e0 917fe602 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/04 16:56 openbsd 079c76c73fb6 e3fbc05e .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2026/01/03 09:32 openbsd 287000ffa12f e3fbc05e .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/31 11:11 openbsd 59b265ba3157 d32f762a .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/30 16:30 openbsd e93b8ae725cf d32f762a .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/29 07:47 openbsd 6a98c69fc684 5dc09de1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/24 17:22 openbsd 1dc30a6de584 5dc09de1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/24 01:28 openbsd 2a2497efc5fa 5dc09de1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/23 22:22 openbsd 2a2497efc5fa 5dc09de1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/19 09:16 openbsd 3f23c8878a83 e14dbeb9 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/18 11:14 openbsd 10e7775f0707 d6d0fdea .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/17 15:36 openbsd 9c2b8e445a0b a066d2bc .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/17 09:13 openbsd 3a6d4b98bde9 a066d2bc .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/16 23:33 openbsd 11531c4859ff a066d2bc .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/15 10:40 openbsd 2c50c5af38ad a066d2bc .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/15 03:50 openbsd b46de5080dd7 a066d2bc .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/14 13:16 openbsd e294fe4a4b1d a066d2bc .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/13 06:50 openbsd b6e97387bb5b a066d2bc .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/12/06 09:08 openbsd f8a2f73b6503 cee4cb10 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
2025/02/04 07:11 openbsd 1eab3ea7ad62 8f267cef .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: db_enter
* Struck through repros no longer work on HEAD.