1st 0xfffffd807f00c720 vmmaplk (&map->lock) @ /syzkaller/managers/setuid/kernel/sys/uvm/uvm_fault.c:1442 2nd 0xfffffd8078f57b38 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(b631ef844ceca948,81,fffffd8078f57b28,fffffd8078f57b28,0) at witness_checkorder+0x12f9 witness_debugger sys/kern/subr_witness.c:2543 [inline] witness_checkorder(b631ef844ceca948,81,fffffd8078f57b28,fffffd8078f57b28,0) at witness_checkorder+0x12f9 sys/kern/subr_witness.c:1089 _rw_enter(a914b92be5ae0752,60b,fffffd8078f57b28,ffffffff81edebdf) at _rw_enter+0xbf _rrw_enter(d612cefddb526c2e,fffffd8078f4e2b8,ffffffff8139fd50,0) at _rrw_enter+0x5c sys/kern/kern_rwlock.c:410 VOP_LOCK(a6af4d19f5391f5d,fffffd8078f4e2b8) at VOP_LOCK+0x55 sys/kern/vfs_vops.c:598 vn_lock(feb93e9cc1c43591,1000) at vn_lock+0x6e sys/kern/vfs_vnops.c:549 uvn_io(49b4834b377d3697,0,0,fffffd806b7b5b90,0) at uvn_io+0x2ca sys/uvm/uvm_vnode.c:1188 uvn_get(31affd01764c3092,ffffffff8146c190,fffffd806b7b5b90,fffffd806af1f558,0,2) at uvn_get+0x206 sys/uvm/uvm_vnode.c:1048 uvm_fault(49b4834b3789c2c1,20ff9000,0,2) at uvm_fault+0x12c1 sys/uvm/uvm_fault.c:1023 uvm_fault_wire(a64a4ccf844ccabf,2,20ff9000,fffffd806af1f558) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1293 uvm_map_pageable_wire(a6af4d19f5495863,fffffd806af1f558,20fff000,20ff6000,0,4) at uvm_map_pageable_wire+0x2fd sys/uvm/uvm_map.c:2258 uvm_map_protect(5d656e4d06841c02,10,ffff800020bba720,1aad9c2fb38,0) at uvm_map_protect+0x610 sys/uvm/uvm_map.c:3294 syscall(c2cea5daacdd0a73) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(c2cea5daacdd0a73) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffa4,0,3,1a83772e010) at Xsyscall+0x128 end of kernel end trace frame: 0x1aad9c2fbc0, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020ca0e20 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800002b4b000 rax 0xffff800001946840 r8 0xffffffff817c727f witness_checkorder+0x12cf r9 0x5 r10 0x3d315a252d377b47 r11 0xf2426c331a8ecc34 r12 0xfffffd80025cdc30 r13 0xffffffff81ebbd52 cmd0646_9_tim_udma+0xc96d r14 0xffffffff8227b5e0 w_lodata+0x50ff0 r15 0xffffffff82280440 w_lodata+0x55e50 rip 0xffffffff81107618 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020ca0e10 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor1) pid=321983 stat=onproc flags process=10 proc=4000000 pri=72, usrpri=72, nice=20 forw=0xffffffffffffffff, list=0xffff800020bba978,0xffffffff82300be0 process=0xffff800020b953c0 user=0xffff800020c9c000, vmspace=0xfffffd807f00c708 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49210 236026 30046 32767 2 0x10 syz-executor1 *49210 321983 30046 32767 7 0x4000010 syz-executor1 54472 10808 26844 32767 2 0x10 syz-executor0 54472 4312 26844 32767 3 0x4000090 fifor syz-executor0 18071 485243 0 0 3 0x14200 bored sosplice 30046 61134 39776 32767 3 0x90 nanosleep syz-executor1 26844 521118 91980 32767 3 0x90 nanosleep syz-executor0 39776 502663 91044 0 3 0x82 wait syz-executor1 91980 165438 91044 0 3 0x82 wait syz-executor0 91044 455631 31472 0 3 0x82 thrsleep syz-fuzzer 91044 400142 31472 0 3 0x4000082 thrsleep syz-fuzzer 91044 337270 31472 0 3 0x4000082 thrsleep syz-fuzzer 91044 287583 31472 0 3 0x4000082 thrsleep syz-fuzzer 91044 277384 31472 0 3 0x4000082 kqread syz-fuzzer 91044 61784 31472 0 3 0x4000082 thrsleep syz-fuzzer 91044 14938 31472 0 3 0x4000082 thrsleep syz-fuzzer 91044 36793 31472 0 3 0x4000082 thrsleep syz-fuzzer 91044 380319 31472 0 3 0x4000082 thrsleep syz-fuzzer 91044 405515 31472 0 3 0x4000082 thrsleep syz-fuzzer 31472 43766 33329 0 3 0x10008a pause ksh 33329 332506 55040 0 3 0x92 select sshd 83688 284788 1 0 3 0x100083 ttyin getty 55040 34166 1 0 3 0x80 select sshd 14228 88646 95677 73 7 0x100090 syslogd 95677 201699 1 0 3 0x100082 netio syslogd 90053 87608 1 77 3 0x100090 poll dhclient 92935 58817 1 0 3 0x80 poll dhclient 92680 470493 0 0 2 0x14200 zerothread 68915 35340 0 0 3 0x14200 aiodoned aiodoned 22344 217695 0 0 3 0x14200 syncer update 55165 355928 0 0 3 0x14200 cleaner cleaner 22312 2124 0 0 3 0x14200 reaper reaper 58338 397063 0 0 3 0x14200 pgdaemon pagedaemon 51378 381514 0 0 3 0x14200 bored crynlk 81393 180361 0 0 3 0x14200 bored crypto 17772 462918 0 0 3 0x40014200 acpi0 acpi0 54029 33608 0 0 3 0x40014200 idle1 20322 520848 0 0 3 0x14200 bored softnet 72504 364515 0 0 3 0x14200 bored systqmp 38770 392402 0 0 3 0x14200 bored systq 61052 44125 0 0 3 0x40014200 bored softclock 27032 258409 0 0 3 0x40014200 idle0 1 29901 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper