1st 0xfffffd806e92fcc8 vmmaplk (&map->lock) @ /syzkaller/managers/setuid/kernel/sys/uvm/uvm_fault.c:1442 2nd 0xfffffd807ec1de68 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_mlock+0x187 #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(6531b356779a33e,81,fffffd807ec1de58,fffffd807ec1de58,0) at witness_checkorder+0x12f9 witness_debugger sys/kern/subr_witness.c:2543 [inline] witness_checkorder(6531b356779a33e,81,fffffd807ec1de58,fffffd807ec1de58,0) at witness_checkorder+0x12f9 sys/kern/subr_witness.c:1089 _rw_enter(28a82c7f6ae59ce0,60b,fffffd807ec1de58,ffffffff81ee1643) at _rw_enter+0xbf _rrw_enter(de4438c9839cecd8,fffffd8067101800,ffffffff81c4fb70,0) at _rrw_enter+0x5c sys/kern/kern_rwlock.c:410 VOP_LOCK(b8dd63b594f4fa98,fffffd8067101800) at VOP_LOCK+0x55 sys/kern/vfs_vops.c:598 vn_lock(2584874948ef838e,1000) at vn_lock+0x6e sys/kern/vfs_vnops.c:549 uvn_io(a41d3dbea98acab8,0,0,fffffd806857a050,0) at uvn_io+0x2ca sys/uvm/uvm_vnode.c:1188 uvn_get(d905cff9989df17c,ffffffff817d4e70,fffffd806857a050,fffffd806bd81b90,0,1) at uvn_get+0x206 sys/uvm/uvm_vnode.c:1048 uvm_fault(d905cff9989c098d,20010000,0,3) at uvm_fault+0x12c1 sys/uvm/uvm_fault.c:1023 uvm_fault_wire(52729f66e3012ae5,3,20010000,fffffd806bd81b90) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1293 uvm_map_pageable_wire(91cbedae0964023b,20801000,20001000,800000,fffffd806e92fcb0,800000) at uvm_map_pageable_wire+0x2fd sys/uvm/uvm_map.c:2258 sys_mlock(6531b35678af031,10,ffff800020b932d8) at sys_mlock+0x187 sys/uvm/uvm_mmap.c:740 syscall(8fb9fc98af11e155) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(8fb9fc98af11e155) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffa1,0,2,38101cff010) at Xsyscall+0x128 end of kernel end trace frame: 0x383bd21c530, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020c84b10 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff80000434d000 rax 0xffff800000936a80 r8 0xffffffff8142346f witness_checkorder+0x12cf r9 0x5 r10 0xdc85fdb3a46fcd38 r11 0x125403bcd28a26ae r12 0xfffffd80025cec30 r13 0xffffffff81ebc499 cmd0646_9_tim_udma+0xded3 r14 0xffffffff82269830 w_lodata+0x3fe50 r15 0xffffffff8227f830 w_lodata+0x55e50 rip 0xffffffff81391848 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c84b00 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor0) pid=242947 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b924c8,0xffffffff82319e38 process=0xffff800020b946a0 user=0xffff800020c80000, vmspace=0xfffffd806e92fcb0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 24849 48850 48901 32767 7 0x10 syz-executor0 *24849 242947 48901 32767 7 0x4000010 syz-executor0 40563 417737 9493 32767 2 0x10 syz-executor1 9493 507702 50509 0 3 0x82 wait syz-executor1 48901 326592 57596 32767 3 0x90 nanosleep syz-executor0 57596 199820 50509 0 3 0x82 wait syz-executor0 81726 342910 0 0 3 0x14200 bored sosplice 50509 171016 73143 0 3 0x82 nanosleep syz-fuzzer 50509 501271 73143 0 3 0x4000082 nanosleep syz-fuzzer 50509 504574 73143 0 3 0x4000082 thrsleep syz-fuzzer 50509 308995 73143 0 3 0x4000082 thrsleep syz-fuzzer 50509 378171 73143 0 3 0x4000082 thrsleep syz-fuzzer 50509 121797 73143 0 3 0x4000082 thrsleep syz-fuzzer 50509 136989 73143 0 3 0x4000082 thrsleep syz-fuzzer 50509 246142 73143 0 3 0x4000082 thrsleep syz-fuzzer 50509 26143 73143 0 3 0x4000082 thrsleep syz-fuzzer 50509 45985 73143 0 3 0x4000082 kqread syz-fuzzer 73143 446540 6021 0 3 0x10008a pause ksh 6021 387038 87294 0 3 0x92 select sshd 50670 13435 1 0 3 0x100083 ttyin getty 87294 64500 1 0 3 0x80 select sshd 55533 365211 20029 73 2 0x100090 syslogd 20029 51722 1 0 3 0x100082 netio syslogd 7088 454878 1 77 3 0x100090 poll dhclient 52795 243128 1 0 3 0x80 poll dhclient 11032 492562 0 0 3 0x14200 pgzero zerothread 39214 357013 0 0 3 0x14200 aiodoned aiodoned 59459 269547 0 0 3 0x14200 syncer update 98413 190700 0 0 3 0x14200 cleaner cleaner 88112 492283 0 0 3 0x14200 reaper reaper 85423 397469 0 0 3 0x14200 pgdaemon pagedaemon 72871 118930 0 0 3 0x14200 bored crynlk 85576 239588 0 0 3 0x14200 bored crypto 90155 265513 0 0 3 0x40014200 acpi0 acpi0 92890 433933 0 0 3 0x40014200 idle1 83772 471669 0 0 3 0x14200 bored softnet 2661 272898 0 0 3 0x14200 bored systqmp 93371 298189 0 0 3 0x14200 bored systq 16409 2005 0 0 3 0x40014200 bored softclock 90336 93344 0 0 3 0x40014200 idle0 1 263719 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper