1st 0xfffffd807f00c888 vmmaplk (&map->lock) @ /syzkaller/managers/setuid/kernel/sys/uvm/uvm_fault.c:1442 2nd 0xfffffd807965b700 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(f87f4af7e0a7ffce,81,fffffd807965b6f0,fffffd807965b6f0,0) at witness_checkorder+0x12f9 witness_debugger sys/kern/subr_witness.c:2543 [inline] witness_checkorder(f87f4af7e0a7ffce,81,fffffd807965b6f0,fffffd807965b6f0,0) at witness_checkorder+0x12f9 sys/kern/subr_witness.c:1089 _rw_enter(433d793ccca5d92e,60b,fffffd807965b6f0,ffffffff81edebdf) at _rw_enter+0xbf _rrw_enter(df5d21abec7c1363,fffffd807963ebd0,ffffffff8139fd50,0) at _rrw_enter+0x5c sys/kern/kern_rwlock.c:410 VOP_LOCK(3dbb979d99c7620d,fffffd807963ebd0) at VOP_LOCK+0x55 sys/kern/vfs_vops.c:598 vn_lock(5bf94aa337a23f00,1000) at vn_lock+0x6e sys/kern/vfs_vnops.c:549 uvn_io(c423d06c6116cd0e,0,0,fffffd807b3a2168,0) at uvn_io+0x2ca sys/uvm/uvm_vnode.c:1188 uvn_get(fe07280a3fa52133,ffffffff8146c190,fffffd807b3a2168,fffffd8069d0a568,0,0) at uvn_get+0x206 sys/uvm/uvm_vnode.c:1048 uvm_fault(c423d06c61e23958,20fff000,0,2) at uvm_fault+0x12c1 sys/uvm/uvm_fault.c:1023 uvm_fault_wire(be5e2ad4bff683fb,2,20fff000,fffffd8069d0a568) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1293 uvm_map_pageable_wire(3dbb979d99b72533,fffffd8069d0a568,20fff000,20ff6000,0,4) at uvm_map_pageable_wire+0x2fd sys/uvm/uvm_map.c:2258 uvm_map_protect(16b994b3486be1a6,10,ffff800020bbae28,edee478c2c8,0) at uvm_map_protect+0x610 sys/uvm/uvm_map.c:3294 syscall(f79936a023b7dca6) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(f79936a023b7dca6) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffa4,0,3,edcb039a010) at Xsyscall+0x128 end of kernel end trace frame: 0xedee478c350, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020cbd1c0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800000946000 rax 0xffff800001946080 r8 0xffffffff817c727f witness_checkorder+0x12cf r9 0x5 r10 0x866c95fa25dad92 r11 0x43c0d86e1c35e298 r12 0xfffffd80025cdc30 r13 0xffffffff81ebbd52 cmd0646_9_tim_udma+0xc96d r14 0xffffffff8226bdb0 w_lodata+0x417c0 r15 0xffffffff822802e0 w_lodata+0x55cf0 rip 0xffffffff81107618 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020cbd1b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor0) pid=154073 stat=onproc flags process=10 proc=4000000 pri=78, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800020bbb9e0,0xffffffff82300be0 process=0xffff800020b953c0 user=0xffff800020cb8000, vmspace=0xfffffd807f00c870 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 76025 118932 28056 32767 2 0x10 syz-executor0 *76025 154073 28056 32767 7 0x4000010 syz-executor0 28056 22868 16797 32767 3 0x90 nanosleep syz-executor0 16797 383896 48639 0 3 0x82 wait syz-executor0 78776 75806 69632 32767 3 0x10 biowait syz-executor1 69632 487753 48639 0 3 0x82 wait syz-executor1 27806 64690 0 0 3 0x14200 bored sosplice 48639 519682 15251 0 3 0x82 thrsleep syz-fuzzer 48639 221547 15251 0 3 0x4000082 nanosleep syz-fuzzer 48639 487961 15251 0 3 0x4000082 thrsleep syz-fuzzer 48639 104372 15251 0 3 0x4000082 thrsleep syz-fuzzer 48639 3401 15251 0 3 0x4000082 thrsleep syz-fuzzer 48639 239541 15251 0 3 0x4000082 thrsleep syz-fuzzer 48639 322226 15251 0 3 0x4000082 thrsleep syz-fuzzer 48639 455008 15251 0 3 0x4000082 kqread syz-fuzzer 48639 378715 15251 0 3 0x4000082 thrsleep syz-fuzzer 48639 209055 15251 0 3 0x4000082 thrsleep syz-fuzzer 48639 522831 15251 0 3 0x4000082 thrsleep syz-fuzzer 48639 386925 15251 0 3 0x4000082 thrsleep syz-fuzzer 15251 165418 78981 0 3 0x10008a pause ksh 78981 289372 28922 0 3 0x92 select sshd 53613 150412 1 0 3 0x100083 ttyin getty 28922 231736 1 0 3 0x80 select sshd 6725 179845 34058 73 7 0x100090 syslogd 34058 179178 1 0 3 0x100082 netio syslogd 3300 31222 1 77 3 0x100090 poll dhclient 20068 150195 1 0 3 0x80 poll dhclient 69894 133119 0 0 3 0x14200 pgzero zerothread 90906 264838 0 0 3 0x14200 aiodoned aiodoned 19816 219482 0 0 3 0x14200 syncer update 37852 188751 0 0 3 0x14200 cleaner cleaner 48475 348516 0 0 3 0x14200 reaper reaper 1443 469699 0 0 3 0x14200 pgdaemon pagedaemon 19254 162426 0 0 3 0x14200 bored crynlk 27077 449850 0 0 3 0x14200 bored crypto 62499 119975 0 0 3 0x40014200 acpi0 acpi0 48139 116433 0 0 3 0x40014200 idle1 2584 241573 0 0 3 0x14200 bored softnet 63376 56419 0 0 3 0x14200 bored systqmp 35567 393348 0 0 3 0x14200 bored systq 55495 513774 0 0 3 0x40014200 bored softclock 65899 168631 0 0 3 0x40014200 idle0 1 468772 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper