1st 0xfffffd807f00c9f0 vmmaplk (&map->lock) @ /syzkaller/managers/setuid/kernel/sys/uvm/uvm_fault.c:1442 2nd 0xfffffd806cf5b5f0 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_mlockall+0x69 #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(d8f952ddb392a1ba,81,fffffd806cf5b5e0,fffffd806cf5b5e0,0) at witness_checkorder+0x12f9 witness_debugger sys/kern/subr_witness.c:2543 [inline] witness_checkorder(d8f952ddb392a1ba,81,fffffd806cf5b5e0,fffffd806cf5b5e0,0) at witness_checkorder+0x12f9 sys/kern/subr_witness.c:1089 _rw_enter(a562e135fe5b314d,60b,fffffd806cf5b5e0,ffffffff81edebdf) at _rw_enter+0xbf _rrw_enter(43097f2876f6a3d4,fffffd806dcb5e18,ffffffff8139fd50,0) at _rrw_enter+0x5c sys/kern/kern_rwlock.c:410 VOP_LOCK(9e76164626d30022,fffffd806dcb5e18) at VOP_LOCK+0x55 sys/kern/vfs_vops.c:598 vn_lock(7541b5ff5db31a5a,7000) at vn_lock+0x6e sys/kern/vfs_vnops.c:549 uvn_io(a0e3d0514d49fd5b,0,0,fffffd806e770200,6000) at uvn_io+0x2ca sys/uvm/uvm_vnode.c:1188 uvn_get(5a6816772f769f8,ffffffff8146c190,fffffd806e770200,fffffd806bd902a0,6000,3) at uvn_get+0x206 sys/uvm/uvm_vnode.c:1048 uvm_fault(a0e3d0514dbd090d,1b2f920000,ffffffffffffa000,3) at uvm_fault+0x12c1 sys/uvm/uvm_fault.c:1023 uvm_fault_wire(3ca30fe005c5bb7,3,1b2f920000,fffffd806bd902a0) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1293 uvm_map_pageable_wire(9e76164626fac5b5,3,ffff800020b92bd0,4c28d057098,2,10f0) at uvm_map_pageable_wire+0x2fd sys/uvm/uvm_map.c:2258 sys_mlockall(20d4e764dc973d58,10,ffff800020b92bd0) at sys_mlockall+0x69 sys/uvm/uvm_mmap.c:801 syscall(c72d774a24bf0d7d) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(c72d774a24bf0d7d) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffa2,0,1,4c08c9f7010) at Xsyscall+0x128 end of kernel end trace frame: 0x4c28d057120, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020c9cb20 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800002b4d000 rax 0xffff80000314e100 r8 0xffffffff817c727f witness_checkorder+0x12cf r9 0x5 r10 0x38d288b5a5557c49 r11 0x9a870bef015004d6 r12 0xfffffd80025cdc30 r13 0xffffffff81ebbd52 cmd0646_9_tim_udma+0xc96d r14 0xffffffff82279e80 w_lodata+0x4f890 r15 0xffffffff82280440 w_lodata+0x55e50 rip 0xffffffff81107618 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c9cb10 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor1) pid=248760 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b93080,0xffffffff82300be0 process=0xffff800020b94358 user=0xffff800020c98000, vmspace=0xfffffd807f00c9d8 estcpu=36, cpticks=5, pctcpu=0.0 user=0, sys=5, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 70162 283898 93247 32767 2 0x10 syz-executor1 *70162 248760 93247 32767 7 0x4000010 syz-executor1 34579 472449 84893 32767 2 0x10 syz-executor0 34579 367409 84893 32767 3 0x4000090 ttyout syz-executor0 93247 391521 49709 32767 7 0x490 syz-executor1 49709 168110 52922 0 3 0x82 wait syz-executor1 84893 341550 55013 32767 2 0x10 syz-executor0 55013 432187 52922 0 3 0x82 wait syz-executor0 52922 478062 48202 0 3 0x82 thrsleep syz-fuzzer 52922 81240 48202 0 2 0x4000482 syz-fuzzer 52922 379478 48202 0 3 0x4000082 thrsleep syz-fuzzer 52922 223769 48202 0 3 0x4000082 thrsleep syz-fuzzer 52922 216168 48202 0 3 0x4000082 thrsleep syz-fuzzer 52922 444196 48202 0 3 0x4000082 thrsleep syz-fuzzer 52922 245949 48202 0 3 0x4000082 thrsleep syz-fuzzer 52922 132171 48202 0 3 0x4000082 thrsleep syz-fuzzer 52922 399779 48202 0 3 0x4000082 thrsleep syz-fuzzer 52922 174908 48202 0 3 0x4000082 kqread syz-fuzzer 48202 16842 58298 0 3 0x10008a pause ksh 58298 156094 32503 0 3 0x92 select sshd 34796 415614 1 0 3 0x100083 ttyin getty 32503 10000 1 0 3 0x80 select sshd 6580 445063 73420 73 2 0x100090 syslogd 73420 65291 1 0 3 0x100082 netio syslogd 8516 484486 1 77 3 0x100090 poll dhclient 2486 459783 1 0 3 0x80 poll dhclient 29635 30593 0 0 2 0x14200 zerothread 58284 416507 0 0 3 0x14200 aiodoned aiodoned 47678 134178 0 0 3 0x14200 syncer update 21321 45569 0 0 3 0x14200 cleaner cleaner 42853 367250 0 0 3 0x14200 reaper reaper 92976 186807 0 0 3 0x14200 pgdaemon pagedaemon 132 354762 0 0 3 0x14200 bored crynlk 99674 451250 0 0 3 0x14200 bored crypto 65101 33098 0 0 3 0x40014200 acpi0 acpi0 44012 378540 0 0 3 0x40014200 idle1 92245 34063 0 0 3 0x14200 bored softnet 88241 360374 0 0 3 0x14200 bored systqmp 87349 116676 0 0 3 0x14200 bored systq 64045 460180 0 0 3 0x40014200 bored softclock 40061 397955 0 0 3 0x40014200 idle0 1 134812 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper