1st 0xfffffd807f00c2e8 vmmaplk (&map->lock) @ /syzkaller/managers/setuid/kernel/sys/uvm/uvm_fault.c:1442 2nd 0xfffffd806569f928 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(46fea9281dede683,81,fffffd806569f918,fffffd806569f918,0) at witness_checkorder+0x12f9 witness_debugger sys/kern/subr_witness.c:2543 [inline] witness_checkorder(46fea9281dede683,81,fffffd806569f918,fffffd806569f918,0) at witness_checkorder+0x12f9 sys/kern/subr_witness.c:1089 _rw_enter(3e565c63fbc15a8b,60b,fffffd806569f918,ffffffff81edebdf) at _rw_enter+0xbf _rrw_enter(1c3205484047c08e,fffffd8065c6f9a8,ffffffff8139fd50,0) at _rrw_enter+0x5c sys/kern/kern_rwlock.c:410 VOP_LOCK(9b8285cc95b7d803,fffffd8065c6f9a8) at VOP_LOCK+0x55 sys/kern/vfs_vops.c:598 vn_lock(1527a3b1e7997ca1,1000) at vn_lock+0x6e sys/kern/vfs_vnops.c:549 uvn_io(684fd98f6fa8a878,0,0,fffffd80664ea4d8,0) at uvn_io+0x2ca sys/uvm/uvm_vnode.c:1188 uvn_get(ea8619f5d661fdd0,ffffffff8146c190,fffffd80664ea4d8,fffffd80664ec408,0,0) at uvn_get+0x206 sys/uvm/uvm_vnode.c:1048 uvm_fault(684fd98f6f5c5c2e,20fff000,0,2) at uvm_fault+0x12c1 sys/uvm/uvm_fault.c:1023 uvm_fault_wire(3e504f4894f672c9,2,20fff000,fffffd80664ec408) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1293 uvm_map_pageable_wire(9b8285cc95c79f3d,fffffd80664ec408,20fff000,20ff6000,0,4) at uvm_map_pageable_wire+0x2fd sys/uvm/uvm_map.c:2258 uvm_map_protect(ceed88b672ea10ef,10,ffff800020b924c8,43861c9b838,0) at uvm_map_protect+0x610 sys/uvm/uvm_map.c:3294 syscall(fb43dad8be3944a6) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(fb43dad8be3944a6) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffa4,0,3,43653f55010) at Xsyscall+0x128 end of kernel end trace frame: 0x43861c9b8c0, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020c6a800 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800001947000 rax 0xffff80000434b040 r8 0xffffffff817c727f witness_checkorder+0x12cf r9 0x5 r10 0x4bc25273fd33592 r11 0xb4a42b4cb7014a89 r12 0xfffffd80025cdc30 r13 0xffffffff81ebbd52 cmd0646_9_tim_udma+0xc96d r14 0xffffffff82271c90 w_lodata+0x476a0 r15 0xffffffff82280440 w_lodata+0x55e50 rip 0xffffffff81107618 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c6a7f0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor0) pid=129593 stat=onproc flags process=10 proc=4000000 pri=81, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800020b92e28,0xffffffff82300be0 process=0xffff800020b94010 user=0xffff800020c66000, vmspace=0xfffffd807f00c2d0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 62201 353797 98099 32767 2 0x10 syz-executor0 *62201 129593 98099 32767 7 0x4000010 syz-executor0 98099 238177 58406 32767 3 0x90 nanosleep syz-executor0 58406 517205 29022 0 3 0x82 wait syz-executor0 91006 323268 0 0 3 0x14200 bored sosplice 29022 440256 20411 0 3 0x82 thrsleep syz-fuzzer 29022 175671 20411 0 3 0x4000082 nanosleep syz-fuzzer 29022 495697 20411 0 3 0x4000082 thrsleep syz-fuzzer 29022 286551 20411 0 3 0x4000082 thrsleep syz-fuzzer 29022 345736 20411 0 3 0x4000082 thrsleep syz-fuzzer 29022 435349 20411 0 3 0x4000082 thrsleep syz-fuzzer 29022 192047 20411 0 3 0x4000082 thrsleep syz-fuzzer 29022 499903 20411 0 3 0x4000082 kqread syz-fuzzer 29022 414220 20411 0 3 0x4000082 thrsleep syz-fuzzer 29022 69959 20411 0 3 0x4000002 biowait syz-fuzzer 20411 262762 51083 0 3 0x10008a pause ksh 51083 201255 39716 0 3 0x92 select sshd 12752 279728 1 0 3 0x100083 ttyin getty 39716 51205 1 0 3 0x80 select sshd 54822 452292 83163 73 7 0x100090 syslogd 83163 196925 1 0 3 0x100082 netio syslogd 80350 242756 1 77 3 0x100090 poll dhclient 5896 357481 1 0 3 0x80 poll dhclient 18780 118701 0 0 3 0x14200 pgzero zerothread 34239 471274 0 0 3 0x14200 aiodoned aiodoned 57966 511332 0 0 3 0x14200 syncer update 94496 226055 0 0 3 0x14200 cleaner cleaner 80800 487112 0 0 3 0x14200 reaper reaper 239 477487 0 0 3 0x14200 pgdaemon pagedaemon 34773 184993 0 0 3 0x14200 bored crynlk 82044 189059 0 0 3 0x14200 bored crypto 61486 450425 0 0 3 0x40014200 acpi0 acpi0 88494 301189 0 0 3 0x40014200 idle1 97864 182009 0 0 3 0x14200 bored softnet 14708 239137 0 0 3 0x14200 bored systqmp 9003 138510 0 0 3 0x14200 bored systq 13911 59917 0 0 3 0x40014200 bored softclock 35417 111565 0 0 3 0x40014200 idle0 1 270893 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper