[ 523.1501452] panic: kernel diagnostic assertion "dev->dv_detaching == curlwp" failed: file "/syzkaller/managers/ci2-netbsd-kubsan/kernel/sys/kern/subr_autoconf.c", line 2176 
[ 523.1668821] cpu0: Begin traceback...
[ 523.1797569] vpanic() at netbsd:vpanic+0x2f2 sys/kern/subr_prf.c:293
[ 523.2597536] kern_assert() at netbsd:kern_assert+0x65 sys/arch/amd64/amd64/db_disasm.c:1074
[ 523.3097515] config_detach_commit() at netbsd:config_detach_commit+0xcb sys/kern/subr_autoconf.c:2176
[ 523.3597550] cdev_detached() at netbsd:cdev_detached+0x188 sys/kern/subr_devsw.c:1383
[ 523.4097536] vdevgone() at netbsd:vdevgone+0x125 sys/kern/vfs_subr.c:524
[ 523.4597541] audiodetach() at netbsd:audiodetach+0xb8 sys/dev/audio/audio.c:1371
[ 523.5097521] config_detach() at netbsd:config_detach+0x495 sys/kern/subr_autoconf.c:2037
[ 523.5697523] config_detach_children() at netbsd:config_detach_children+0x83 sys/kern/subr_autoconf.c:2195
[ 523.6197536] pad_detach() at netbsd:pad_detach+0x87 sys/dev/pad/pad.c:251
[ 523.6697519] config_detach() at netbsd:config_detach+0x495 sys/kern/subr_autoconf.c:2037
[ 523.7297528] fops_pad_close() at netbsd:fops_pad_close+0xb7 pad_close sys/dev/pad/pad.c:423 [inline]
[ 523.7297528] fops_pad_close() at netbsd:fops_pad_close+0xb7 sys/dev/pad/pad.c:433
[ 523.7797509] closef() at netbsd:closef+0x1cd sys/kern/kern_descrip.c:832
[ 523.8297537] fd_free() at netbsd:fd_free+0x502 sys/kern/kern_descrip.c:1571
[ 523.8797516] exit1() at netbsd:exit1+0x3ab sys/kern/kern_exit.c:301
[ 523.9197506] sys_exit() at netbsd:sys_exit+0xd4 sys/kern/kern_exit.c:180
[ 523.9797544] syscall() at netbsd:syscall+0x2da sy_call sys/sys/syscallvar.h:65 [inline]
[ 523.9797544] syscall() at netbsd:syscall+0x2da sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 523.9797544] syscall() at netbsd:syscall+0x2da sys/arch/x86/x86/syscall.c:138
[ 523.9897510] --- syscall (number 1) ---
[ 524.0097558] netbsd:syscall+0x2da:
[ 524.0097558] cpu0: End traceback...
[ 524.0097558] fatal breakpoint trap in supervisor mode
[ 524.0200193] trap type 1 code 0 rip 0xffffffff80221ab5 cs 0x8 rflags 0x246 cr2 0x7bf57662dff8 ilevel 0 rsp 0xffffce00da74d970
[ 524.0330174] curlwp 0xffffb51be0a19640 pid 11084.11084 lowest kstack 0xffffce00da7492c0
[ 524.0409026] Skipping crash dump on recursive panic
[ 524.0409026] panic: UBSan: Undefined Behavior in /syzkaller/managers/ci2-netbsd-kubsan/kernel/sys/dev/wsfb/genfb.c:988:28, member access within null pointer of type 'struct genfb_private'

[ 524.0409026] cpu0: Begin traceback...
[ 524.0409026] vpanic() at netbsd:vpanic+0x2f2 sys/kern/subr_prf.c:293
[ 524.0409026] Report() at netbsd:Report+0x3b sys/../common/lib/libc/misc/ubsan.c:1352
[ 524.0409026] HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x1fb sys/../common/lib/libc/misc/ubsan.c:429
[ 524.0409026] genfb_enable_polling() at netbsd:genfb_enable_polling+0x17e sys/dev/wsfb/genfb.c:988
[ 524.0409026] x86_genfb_ddb_trap_callback() at netbsd:x86_genfb_ddb_trap_callback+0x39 sys/arch/x86/x86/genfb_machdep.c:97
[ 524.0409026] db_trap() at netbsd:db_trap+0x68 sys/ddb/db_trap.c:73
[ 524.0409026] kdb_trap() at netbsd:kdb_trap+0x1aa sys/arch/amd64/amd64/db_interface.c:251
[ 524.0409026] trap() at netbsd:trap+0x5b2 sys/arch/amd64/amd64/trap.c:315
[ 524.0409026] --- trap (number 1) ---
[ 524.0409026] breakpoint() at netbsd:breakpoint+0x5
[ 524.0409026] db_panic() at netbsd:db_panic+0xec sys/ddb/db_panic.c:69
[ 524.0409026] vpanic() at netbsd:vpanic+0x2f2 sys/kern/subr_prf.c:293
[ 524.0409026] kern_assert() at netbsd:kern_assert+0x65 sys/arch/amd64/amd64/db_disasm.c:1074
[ 524.0409026] config_detach_commit() at netbsd:config_detach_commit+0xcb sys/kern/subr_autoconf.c:2176
[ 524.0409026] cdev_detached() at netbsd:cdev_detached+0x188 sys/kern/subr_devsw.c:1383
[ 524.0409026] vdevgone() at netbsd:vdevgone+0x125 sys/kern/vfs_subr.c:524
[ 524.0409026] audiodetach() at netbsd:audiodetach+0xb8 sys/dev/audio/audio.c:1371
[ 524.0409026] config_detach() at netbsd:config_detach+0x495 sys/kern/subr_autoconf.c:2037
[ 524.0409026] config_detach_children() at netbsd:config_detach_children+0x83 sys/kern/subr_autoconf.c:2195
[ 524.0409026] pad_detach() at netbsd:pad_detach+0x87 sys/dev/pad/pad.c:251
[ 524.0409026] config_detach() at netbsd:config_detach+0x495 sys/kern/subr_autoconf.c:2037
[ 524.0409026] fops_pad_close() at netbsd:fops_pad_close+0xb7 pad_close sys/dev/pad/pad.c:423 [inline]
[ 524.0409026] fops_pad_close() at netbsd:fops_pad_close+0xb7 sys/dev/pad/pad.c:433
[ 524.0409026] closef() at netbsd:closef+0x1cd sys/kern/kern_descrip.c:832
[ 524.0409026] fd_free() at netbsd:fd_free+0x502 sys/kern/kern_descrip.c:1571
[ 524.0409026] exit1() at netbsd:exit1+0x3ab sys/kern/kern_exit.c:301
[ 524.0409026] sys_exit() at netbsd:sys_exit+0xd4 sys/kern/kern_exit.c:180
[ 524.0409026] syscall() at netbsd:syscall+0x2da sy_call sys/sys/syscallvar.h:65 [inline]
[ 524.0409026] syscall() at netbsd:syscall+0x2da sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 524.0409026] syscall() at netbsd:syscall+0x2da sys/arch/x86/x86/syscall.c:138
[ 524.0409026] --- syscall (number 1) ---
[ 524.0409026] netbsd:syscall+0x2da:
[ 524.0409026] cpu0: End traceback...
[ 524.0409026] fatal breakpoint trap in supervisor mode
[ 524.0409026] trap type 1 code 0 rip 0xffffffff80221ab5 cs 0x8 rflags 0x246 cr2 0x7bf57662dff8 ilevel 0x8 rsp 0xffffce00da74d040
[ 524.0409026] curlwp 0xffffb51be0a19640 pid 11084.11084 lowest kstack 0xffffce00da7492c0
[ 524.0409026] uvm_fault(0xffffb51bc8e8f1b8, 0x0, 1) -> e
[ 524.0409026] fatal page fault in supervisor mode
[ 524.0409026] trap type 6 code 0 rip 0xffffffff830db90b cs 0x8 rflags 0x10217 cr2 0x1e8 ilevel 0x8 rsp 0xffffce00da74cc70
[ 524.0409026] curlwp 0xffffb51be0a19640 pid 11084.11084 lowest kstack 0xffffce00da7492c0
kernel: page fault trap, code=0
[ 524.0409026] uvm_fault(0xffffb51bc8e8f1b8, 0x0, 1) -> e
[ 524.0409026] fatal page fault in supervisor mode
[ 524.0409026] trap type 6 code 0 rip 0xffffffff830db90b cs 0x8 rflags 0x10217 cr2 0x1e8 ilevel 0x8 rsp 0xffffce00da74c8a0
[ 524.0409026] curlwp 0xffffb51be0a19640 pid 11084.11084 lowest kstack 0xffffce00da7492c0
kernel: page fault trap, code=0
[ 524.0409026] uvm_fault(0xffffb51bc8e8f1b8, 0x0, 1) -> e
[ 524.0409026] fatal page fault in supervisor mode
[ 524.0409026] trap type 6 code 0 rip 0xffffffff830db90b cs 0x8 rflags 0x10217 cr2 0x1e8 ilevel 0x8 rsp 0xffffce00da74c4d0
[ 524.0409026] curlwp 0xffffb51be0a19640 pid 11084.11084 lowest kstack 0xffffce00da7492c0
kernel: page fault trap, code=0
[ 524.0409026] uvm_fault(0xffffb51bc8e8f1b8, 0x0, 1) -> e
[ 524.0409026] fatal page fault in supervisor mode
[ 524.0409026] trap type 6 code 0 rip 0xffffffff830db90b cs 0x8 rflags 0x10217 cr2 0x1e8 ilevel 0x8 rsp 0xffffce00da74c100
[ 524.0409026] curlwp 0xffffb51be0a19640 pid 11084.11084 lowest kstack 0xffffce00da7492c0
kernel: page fault trap, code=0
[ 524.0409026] uvm_fault(0xffffb51bc8e8f1b8, 0x0, 1) -> e
[ 524.0409026] fatal page fault in supervisor mode
[ 524.0409026] trap type 6 code 0 rip 0xffffffff830db90b cs 0x8 rflags 0x10217 cr2 0x1e8 ilevel 0x8 rsp 0xffffce00da74bd30
[ 524.0409026] curlwp 0xffffb51be0a19640 pid 11084.11084 lowest kstack 0xffffce00da7492c0
kernel: page fault trap, code=0
[ 524.0409026] uvm_fault(0xffffb51bc8e8f1b8, 0x0, 1) -> e
[ 524.0409026] fatal page fault in supervisor mode
[ 524.0409026] trap type 6 code 0 rip 0xffffffff830db90b cs 0x8 rflags 0x10217 cr2 0x1e8 ilevel 0x8 rsp 0xffffce00da74b960
[ 524.0409026] curlwp 0xffffb51be0a19640 pid 11084.11084 lowest kstack 0xffffce00da7492c0
kernel: page fault trap, code=0