1st 0xfffffd806e926e30 vmmaplk (&map->lock) @ /syzkaller/managers/setuid/kernel/sys/uvm/uvm_fault.c:1442 2nd 0xfffffd8069e5f920 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{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(9bcac3afe8d4689b,81,fffffd8069e5f910,fffffd8069e5f910,0) at witness_checkorder+0x12f9 witness_debugger sys/kern/subr_witness.c:2543 [inline] witness_checkorder(9bcac3afe8d4689b,81,fffffd8069e5f910,fffffd8069e5f910,0) at witness_checkorder+0x12f9 sys/kern/subr_witness.c:1089 _rw_enter(b8b2fd90d0493fd3,60b,fffffd8069e5f910,ffffffff81edebdf) at _rw_enter+0xbf _rrw_enter(3c903936bae605c4,fffffd80660b9528,ffffffff8139fd50,0) at _rrw_enter+0x5c sys/kern/kern_rwlock.c:410 VOP_LOCK(76c8772c02979fcd,fffffd80660b9528) at VOP_LOCK+0x55 sys/kern/vfs_vops.c:598 vn_lock(e916f8af58fe9fcb,1000) at vn_lock+0x6e sys/kern/vfs_vnops.c:549 uvn_io(6f41947431d9a01,0,0,fffffd80780e7c18,0) at uvn_io+0x2ca sys/uvm/uvm_vnode.c:1188 uvn_get(fd94af259b26b681,ffffffff8146c190,fffffd80780e7c18,fffffd806af01790,0,1) at uvn_get+0x206 sys/uvm/uvm_vnode.c:1048 uvm_fault(6f4194743e96e57,21000000,0,1) at uvm_fault+0x12c1 sys/uvm/uvm_fault.c:1023 uvm_fault_wire(183ae035624b8a76,1,21000000,fffffd806af01790) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1293 uvm_map_pageable_wire(76c8772c02e7d8f3,fffffd806af01790,21000000,20ffc000,0,4) at uvm_map_pageable_wire+0x2fd sys/uvm/uvm_map.c:2258 uvm_map_protect(f02c5504e8699462,10,ffff800020b939e0,ea7ff6577d8,0) at uvm_map_protect+0x610 sys/uvm/uvm_map.c:3294 syscall(5fcd84a3f5f42755) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(5fcd84a3f5f42755) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffa4,0,3,ea5c1105010) at Xsyscall+0x128 end of kernel end trace frame: 0xea7ff657860, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020c40f70 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800001948000 rax 0xffff800001946340 r8 0xffffffff817c727f witness_checkorder+0x12cf r9 0x5 r10 0xa0327b5c741e5661 r11 0x99cd4fa408ebec3f r12 0xfffffd80025cdc30 r13 0xffffffff81ebbd52 cmd0646_9_tim_udma+0xc96d r14 0xffffffff8226ec70 w_lodata+0x44680 r15 0xffffffff82280440 w_lodata+0x55e50 rip 0xffffffff81107618 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c40f60 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor0) pid=126478 stat=onproc flags process=10 proc=4000000 pri=51, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020b92018,0xffff800020b93090 process=0xffff800020b953c0 user=0xffff800020c3c000, vmspace=0xfffffd806e926e18 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 60311 438056 31311 32767 7 0x10 syz-executor1 60311 248690 31311 32767 3 0x4000090 fsleep syz-executor1 90795 159823 49370 32767 2 0x10 syz-executor0 *90795 126478 49370 32767 7 0x4000010 syz-executor0 49370 343202 95274 32767 3 0x90 nanosleep syz-executor0 95274 463415 7821 0 3 0x82 wait syz-executor0 31311 161625 34012 32767 3 0x90 nanosleep syz-executor1 34012 166641 7821 0 3 0x82 wait syz-executor1 71240 253795 0 0 3 0x14200 bored sosplice 7821 266152 88224 0 3 0x82 thrsleep syz-fuzzer 7821 275811 88224 0 3 0x4000082 thrsleep syz-fuzzer 7821 348411 88224 0 3 0x4000082 thrsleep syz-fuzzer 7821 102287 88224 0 3 0x4000082 thrsleep syz-fuzzer 7821 171744 88224 0 3 0x4000082 kqread syz-fuzzer 7821 50998 88224 0 3 0x4000082 thrsleep syz-fuzzer 7821 499392 88224 0 3 0x4000082 thrsleep syz-fuzzer 7821 67081 88224 0 3 0x4000082 thrsleep syz-fuzzer 7821 192114 88224 0 3 0x4000082 thrsleep syz-fuzzer 7821 150881 88224 0 3 0x4000082 thrsleep syz-fuzzer 88224 490696 88269 0 3 0x10008a pause ksh 88269 108484 80398 0 3 0x92 select sshd 60654 435688 1 0 3 0x100083 ttyin getty 80398 218577 1 0 3 0x80 select sshd 98421 396364 67918 73 2 0x100090 syslogd 67918 53377 1 0 3 0x100082 netio syslogd 80342 17311 1 77 3 0x100090 poll dhclient 27035 84772 1 0 3 0x80 poll dhclient 87505 44538 0 0 2 0x14200 zerothread 92560 62907 0 0 3 0x14200 aiodoned aiodoned 29155 346949 0 0 3 0x14200 syncer update 61282 423969 0 0 3 0x14200 cleaner cleaner 58387 276410 0 0 3 0x14200 reaper reaper 78443 44229 0 0 3 0x14200 pgdaemon pagedaemon 37698 263178 0 0 3 0x14200 bored crynlk 52504 348979 0 0 3 0x14200 bored crypto 55950 206176 0 0 3 0x40014200 acpi0 acpi0 17427 241925 0 0 3 0x40014200 idle1 79985 89250 0 0 3 0x14200 bored softnet 2980 27359 0 0 3 0x14200 bored systqmp 56170 79327 0 0 3 0x14200 bored systq 60205 458671 0 0 3 0x40014200 bored softclock 61178 258878 0 0 3 0x40014200 idle0 1 60560 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper