1st 0xfffffd807f00ccc0 vmmaplk (&map->lock) @ /syzkaller/managers/setuid/kernel/sys/uvm/uvm_fault.c:1442 2nd 0xfffffd8069bed1b8 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 uvm_map_protect+0x610 #11 syscall+0x5a0 #12 Xsyscall+0x128 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 witness_checkorder(2781ef0ef4763b70,81,fffffd8069bed1a8,fffffd8069bed1a8,0) at witness_checkorder+0x12f9 witness_debugger sys/kern/subr_witness.c:2543 [inline] witness_checkorder(2781ef0ef4763b70,81,fffffd8069bed1a8,fffffd8069bed1a8,0) at witness_checkorder+0x12f9 sys/kern/subr_witness.c:1089 _rw_enter(3ac61b6c02610af3,60b,fffffd8069bed1a8,ffffffff81edebdf) at _rw_enter+0xbf _rrw_enter(19755174279d243c,fffffd8077f4f2b0,ffffffff8139fd50,0) at _rrw_enter+0x5c sys/kern/kern_rwlock.c:410 VOP_LOCK(5060cf5da2d6c15d,fffffd8077f4f2b0) at VOP_LOCK+0x55 sys/kern/vfs_vops.c:598 vn_lock(aca0f3cc391c628a,1000) at vn_lock+0x6e sys/kern/vfs_vnops.c:549 uvn_io(80736f83271d9f58,0,0,fffffd8066882e10,0) at uvn_io+0x2ca sys/uvm/uvm_vnode.c:1188 uvn_get(ae321b090c9a471b,ffffffff8146c190,fffffd8066882e10,fffffd806aeac1b0,0,2) at uvn_get+0x206 sys/uvm/uvm_vnode.c:1048 uvm_fault(80736f8327e96b0e,20ff7000,0,2) at uvm_fault+0x12c1 sys/uvm/uvm_fault.c:1023 uvm_fault_wire(b922746e71b0eda4,2,20ff7000,fffffd806aeac1b0) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1293 uvm_map_pageable_wire(5060cf5da2a68663,fffffd806aeac1b0,20fff000,20ff6000,0,4) at uvm_map_pageable_wire+0x2fd sys/uvm/uvm_map.c:2258 uvm_map_protect(15e489e69f2ba8ce,10,ffff800020bbabd0,35f7cec2168,0) at uvm_map_protect+0x610 sys/uvm/uvm_map.c:3294 syscall(33ef73d6713e73d9) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(33ef73d6713e73d9) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffa4,0,3,35cf75bf010) at Xsyscall+0x128 end of kernel end trace frame: 0x35f7cec21f0, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020c4f430 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff80000454c000 rax 0xffff800001d46900 r8 0xffffffff817c727f witness_checkorder+0x12cf r9 0x5 r10 0xcc108c29f0d402ed r11 0x8b1697d7eb6ebe39 r12 0xfffffd80025cdc30 r13 0xffffffff81ebbd52 cmd0646_9_tim_udma+0xc96d r14 0xffffffff8227bab0 w_lodata+0x514c0 r15 0xffffffff82280440 w_lodata+0x55e50 rip 0xffffffff81107618 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c4f420 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor1) pid=13377 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020bba270,0xffffffff82300be0 process=0xffff800020b946a0 user=0xffff800020c4a000, vmspace=0xfffffd807f00cca8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 32317 328710 86441 32767 2 0x10 syz-executor1 *32317 13377 86441 32767 7 0x4000010 syz-executor1 86441 259183 11675 32767 3 0x90 nanosleep syz-executor1 11675 222019 88457 0 3 0x82 wait syz-executor1 39121 461284 60756 32767 3 0x10 biowait syz-executor0 60756 87894 88457 0 3 0x82 wait syz-executor0 88457 313741 19680 0 3 0x82 thrsleep syz-fuzzer 88457 511001 19680 0 3 0x4000082 nanosleep syz-fuzzer 88457 107456 19680 0 3 0x4000082 thrsleep syz-fuzzer 88457 238151 19680 0 3 0x4000082 thrsleep syz-fuzzer 88457 143985 19680 0 3 0x4000082 thrsleep syz-fuzzer 88457 203770 19680 0 3 0x4000082 thrsleep syz-fuzzer 88457 42719 19680 0 3 0x4000082 thrsleep syz-fuzzer 88457 330951 19680 0 3 0x4000082 kqread syz-fuzzer 88457 30482 19680 0 3 0x4000082 nanosleep syz-fuzzer 88457 394224 19680 0 3 0x4000082 thrsleep syz-fuzzer 19680 354770 6114 0 3 0x10008a pause ksh 6114 316440 68328 0 3 0x92 select sshd 97788 334262 1 0 3 0x100083 ttyin getty 68328 225510 1 0 3 0x80 select sshd 87815 335396 54874 73 7 0x100090 syslogd 54874 88878 1 0 3 0x100082 netio syslogd 57582 224488 1 77 3 0x100090 poll dhclient 54533 375846 1 0 3 0x80 poll dhclient 2939 134633 0 0 3 0x14200 pgzero zerothread 56471 300803 0 0 3 0x14200 aiodoned aiodoned 8820 434679 0 0 3 0x14200 syncer update 57858 127135 0 0 3 0x14200 cleaner cleaner 50252 369673 0 0 3 0x14200 reaper reaper 55747 484092 0 0 3 0x14200 pgdaemon pagedaemon 28411 120945 0 0 3 0x14200 bored crynlk 9495 251777 0 0 3 0x14200 bored crypto 71434 429753 0 0 3 0x40014200 acpi0 acpi0 22433 249233 0 0 3 0x40014200 idle1 7796 508723 0 0 3 0x14200 bored softnet 60724 122377 0 0 3 0x14200 bored systqmp 90483 246889 0 0 3 0x14200 bored systq 65216 52486 0 0 3 0x40014200 bored softclock 6244 18257 0 0 3 0x40014200 idle0 1 237246 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper