1st 0xfffffd806e937728 vmmaplk (&map->lock) @ /syzkaller/managers/setuid/kernel/sys/uvm/uvm_fault.c:1442 2nd 0xfffffd807dc6e810 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(5cfaca0864c39bf6,81,fffffd807dc6e800,fffffd807dc6e800,0) at witness_checkorder+0x12f9 witness_debugger sys/kern/subr_witness.c:2543 [inline] witness_checkorder(5cfaca0864c39bf6,81,fffffd807dc6e800,fffffd807dc6e800,0) at witness_checkorder+0x12f9 sys/kern/subr_witness.c:1089 _rw_enter(1f149842a7b946a1,60b,fffffd807dc6e800,ffffffff81edebdf) at _rw_enter+0xbf _rrw_enter(2ea6fe9c1db775a7,fffffd8064e18558,ffffffff8139fd50,0) at _rrw_enter+0x5c sys/kern/kern_rwlock.c:410 VOP_LOCK(1675d73e720c821a,fffffd8064e18558) at VOP_LOCK+0x55 sys/kern/vfs_vops.c:598 vn_lock(3a803ecbe98fa291,1000) at vn_lock+0x6e sys/kern/vfs_vnops.c:549 uvn_io(266da31c2dcdaff1,0,0,fffffd807df4e250,0) at uvn_io+0x2ca sys/uvm/uvm_vnode.c:1188 uvn_get(a259ac00405727f9,ffffffff8146c190,fffffd807df4e250,fffffd80695bc438,0,0) at uvn_get+0x206 sys/uvm/uvm_vnode.c:1048 uvm_fault(266da31c2d395ba7,20fff000,0,2) at uvm_fault+0x12c1 sys/uvm/uvm_fault.c:1023 uvm_fault_wire(56fb3e8811d56ff,2,20fff000,fffffd80695bc438) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1293 uvm_map_pageable_wire(1675d73e727cc524,fffffd80695bc438,20fff000,20ff6000,0,4) at uvm_map_pageable_wire+0x2fd sys/uvm/uvm_map.c:2258 uvm_map_protect(2792d36144efd043,10,ffff800020b939e0,788d67a0b28,0) at uvm_map_protect+0x610 sys/uvm/uvm_map.c:3294 syscall(a822deac97086bb6) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(a822deac97086bb6) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffa4,0,3,7867fd37010) at Xsyscall+0x128 end of kernel end trace frame: 0x788d67a0bb0, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020c5abd0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff80000434d000 rax 0xffff800000021380 r8 0xffffffff817c727f witness_checkorder+0x12cf r9 0x5 r10 0x57dd215316e21a82 r11 0xa68ae7172869cec5 r12 0xfffffd80025cdc30 r13 0xffffffff81ebbd52 cmd0646_9_tim_udma+0xc96d r14 0xffffffff8226ab20 w_lodata+0x40530 r15 0xffffffff82280440 w_lodata+0x55e50 rip 0xffffffff81107618 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c5abc0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor1) pid=211318 stat=onproc flags process=10 proc=4000000 pri=78, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800020b93788,0xffffffff82300be0 process=0xffff800020b94358 user=0xffff800020c56000, vmspace=0xfffffd806e937710 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 31425 350913 40984 32767 7 0x10 syz-executor1 *31425 211318 40984 32767 7 0x4000010 syz-executor1 40984 293630 25661 32767 3 0x90 nanosleep syz-executor1 25661 402337 99236 0 3 0x82 wait syz-executor1 26152 451736 62056 32767 3 0x10 biowait syz-executor0 62056 315758 99236 0 3 0x82 wait syz-executor0 11312 503328 0 0 3 0x14200 bored sosplice 99236 509536 15071 0 3 0x82 kqread syz-fuzzer 99236 337917 15071 0 3 0x4000082 thrsleep syz-fuzzer 99236 240694 15071 0 3 0x4000082 thrsleep syz-fuzzer 99236 252611 15071 0 3 0x4000082 thrsleep syz-fuzzer 99236 363734 15071 0 3 0x4000082 thrsleep syz-fuzzer 99236 430809 15071 0 3 0x4000082 thrsleep syz-fuzzer 99236 394342 15071 0 3 0x4000082 thrsleep syz-fuzzer 99236 341587 15071 0 3 0x4000082 thrsleep syz-fuzzer 99236 458618 15071 0 3 0x4000082 thrsleep syz-fuzzer 99236 352023 15071 0 3 0x4000082 thrsleep syz-fuzzer 99236 214354 15071 0 3 0x4000082 thrsleep syz-fuzzer 99236 369388 15071 0 3 0x4000082 thrsleep syz-fuzzer 15071 281027 70212 0 3 0x10008a pause ksh 70212 288955 89501 0 3 0x92 select sshd 75876 86133 1 0 3 0x100083 ttyin getty 89501 21647 1 0 3 0x80 select sshd 63414 90654 88075 73 2 0x100090 syslogd 88075 453932 1 0 3 0x100082 netio syslogd 21894 51787 1 77 3 0x100090 poll dhclient 13516 111998 1 0 3 0x80 poll dhclient 5385 76348 0 0 3 0x14200 pgzero zerothread 52188 266792 0 0 3 0x14200 aiodoned aiodoned 66834 83096 0 0 3 0x14200 syncer update 26920 510728 0 0 3 0x14200 cleaner cleaner 9197 248493 0 0 3 0x14200 reaper reaper 57293 222375 0 0 3 0x14200 pgdaemon pagedaemon 43076 70527 0 0 3 0x14200 bored crynlk 49630 259910 0 0 3 0x14200 bored crypto 14353 314030 0 0 3 0x40014200 acpi0 acpi0 8011 87206 0 0 3 0x40014200 idle1 25647 230528 0 0 3 0x14200 bored softnet 36025 164431 0 0 3 0x14200 bored systqmp 38084 361408 0 0 3 0x14200 bored systq 59416 406767 0 0 3 0x40014200 bored softclock 51604 24373 0 0 3 0x40014200 idle0 1 509278 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper