1st 0xfffffd807f00c720 vmmaplk (&map->lock) @ /syzkaller/managers/setuid/kernel/sys/uvm/uvm_fault.c:1442 2nd 0xfffffd806cf64d60 inode (&ip->i_lock) @ /syzkaller/managers/setuid/kernel/sys/ufs/ufs/ufs_vnops.c:1547 lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at: #0 witness_checkorder+0x6d8 #1 _rw_enter+0xbf #2 vm_map_lock_ln+0x14e #3 uvm_map+0x2e2 #4 km_alloc+0x19a #5 pool_multi_alloc_ni+0xe4 #6 pool_p_alloc+0x70 #7 pool_do_get+0x127 #8 pool_get+0x104 #9 ufsdirhash_build+0x40b #10 ufs_lookup+0x2a5 #11 VOP_LOOKUP+0x63 #12 vfs_lookup+0x552 #13 namei+0x4af #14 start_init+0xd6 lock order "&map->lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x6d8 #1 _rw_enter+0xbf #2 _rrw_enter+0x5c #3 VOP_LOCK+0x55 #4 vn_lock+0x6e #5 uvn_io+0x2ca #6 uvn_get+0x206 #7 uvm_fault+0x12c1 #8 uvm_fault_wire+0x70 #9 uvm_map_pageable_wire+0x2fd #10 sys_mlockall+0x69 #11 syscall+0x5a0 #12 Xsyscall+0x128 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 witness_checkorder(825ba27fd32d0607,81,fffffd806cf64d50,fffffd806cf64d50,0) at witness_checkorder+0x12f9 witness_debugger sys/kern/subr_witness.c:2543 [inline] witness_checkorder(825ba27fd32d0607,81,fffffd806cf64d50,fffffd806cf64d50,0) at witness_checkorder+0x12f9 sys/kern/subr_witness.c:1089 _rw_enter(a5955e97306ebd8d,60b,fffffd806cf64d50,ffffffff81edebdf) at _rw_enter+0xbf _rrw_enter(d10d3642559f21b5,fffffd8078d39d50,ffffffff8139fd50,0) at _rrw_enter+0x5c sys/kern/kern_rwlock.c:410 VOP_LOCK(4b1a629b2a50b4a9,fffffd8078d39d50) at VOP_LOCK+0x55 sys/kern/vfs_vops.c:598 vn_lock(33c371ee4ffb8a18,7000) at vn_lock+0x6e sys/kern/vfs_vnops.c:549 uvn_io(6f3bf4359f5d2c89,0,0,fffffd806dd514d0,6000) at uvn_io+0x2ca sys/uvm/uvm_vnode.c:1188 uvn_get(333d7690d9359c41,ffffffff8146c190,fffffd806dd514d0,fffffd806ccb9550,6000,3) at uvn_get+0x206 sys/uvm/uvm_vnode.c:1048 uvm_fault(6f3bf4359fa9d8df,1b2fd20000,ffffffffffffa000,3) at uvm_fault+0x12c1 sys/uvm/uvm_fault.c:1023 uvm_fault_wire(3513001c4c7f74c1,3,1b2fd20000,fffffd806ccb9550) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1293 uvm_map_pageable_wire(4b1a629b2a79713e,3,ffff800020bbabd0,35371a0c488,2,10f0) at uvm_map_pageable_wire+0x2fd sys/uvm/uvm_map.c:2258 sys_mlockall(1fe676f032f8738f,10,ffff800020bbabd0) at sys_mlockall+0x69 sys/uvm/uvm_mmap.c:801 syscall(1d3992d4a847559b) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(1d3992d4a847559b) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffa2,0,1,3515d11c010) at Xsyscall+0x128 end of kernel end trace frame: 0x35371a0c510, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020c94820 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800002b4b000 rax 0xffff800001946840 r8 0xffffffff817c727f witness_checkorder+0x12cf r9 0x5 r10 0xe2c66d2b29ad24af r11 0x96a320c53a255f94 r12 0xfffffd80025cdc30 r13 0xffffffff81ebbd52 cmd0646_9_tim_udma+0xc96d r14 0xffffffff8227a980 w_lodata+0x50390 r15 0xffffffff82280440 w_lodata+0x55e50 rip 0xffffffff81107618 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c94810 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor1) pid=422194 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020bba270,0xffffffff82300be0 process=0xffff800020b94d30 user=0xffff800020c90000, vmspace=0xfffffd807f00c708 estcpu=36, cpticks=5, pctcpu=0.0 user=0, sys=5, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 19555 498892 58925 32767 7 0x10 syz-executor1 *19555 422194 58925 32767 7 0x4000010 syz-executor1 96530 261980 0 0 3 0x14200 bored sosplice 59053 500024 56007 32767 3 0x10 biowait syz-executor0 56007 113099 70961 0 3 0x82 wait syz-executor0 58925 233875 5937 32767 3 0x90 nanosleep syz-executor1 5937 124209 70961 0 3 0x82 wait syz-executor1 70961 155114 3025 0 3 0x82 thrsleep syz-fuzzer 70961 114510 3025 0 3 0x4000082 nanosleep syz-fuzzer 70961 92446 3025 0 3 0x4000082 thrsleep syz-fuzzer 70961 208728 3025 0 3 0x4000082 thrsleep syz-fuzzer 70961 43238 3025 0 3 0x4000082 thrsleep syz-fuzzer 70961 215407 3025 0 3 0x4000082 kqread syz-fuzzer 70961 311256 3025 0 3 0x4000082 thrsleep syz-fuzzer 70961 196278 3025 0 3 0x4000082 thrsleep syz-fuzzer 70961 208150 3025 0 3 0x4000082 thrsleep syz-fuzzer 70961 412456 3025 0 3 0x4000082 thrsleep syz-fuzzer 3025 433211 31735 0 3 0x10008a pause ksh 31735 331775 16934 0 3 0x92 select sshd 4452 92651 1 0 3 0x100083 ttyin getty 16934 58313 1 0 3 0x80 select sshd 81197 49729 27648 73 2 0x100090 syslogd 27648 479772 1 0 3 0x100082 netio syslogd 11493 270267 1 77 3 0x100090 poll dhclient 62441 403784 1 0 3 0x80 poll dhclient 17409 201203 0 0 2 0x14200 zerothread 59609 503547 0 0 3 0x14200 aiodoned aiodoned 3393 467401 0 0 3 0x14200 syncer update 92865 224898 0 0 3 0x14200 cleaner cleaner 81440 433683 0 0 3 0x14200 reaper reaper 38684 241773 0 0 3 0x14200 pgdaemon pagedaemon 50034 324560 0 0 3 0x14200 bored crynlk 64741 396957 0 0 3 0x14200 bored crypto 79237 257577 0 0 3 0x40014200 acpi0 acpi0 37151 189602 0 0 3 0x40014200 idle1 45014 255520 0 0 3 0x14200 bored softnet 34833 371501 0 0 3 0x14200 bored systqmp 37690 502942 0 0 3 0x14200 bored systq 51145 181738 0 0 3 0x40014200 bored softclock 2065 309536 0 0 3 0x40014200 idle0 1 329319 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper