1st 0xfffffd807f00c9f0 vmmaplk (&map->lock) @ /syzkaller/managers/setuid/kernel/sys/uvm/uvm_fault.c:1442 2nd 0xfffffd8069b814e8 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(356d4e48713398dc,81,fffffd8069b814d8,fffffd8069b814d8,0) at witness_checkorder+0x12f9 witness_debugger sys/kern/subr_witness.c:2543 [inline] witness_checkorder(356d4e48713398dc,81,fffffd8069b814d8,fffffd8069b814d8,0) at witness_checkorder+0x12f9 sys/kern/subr_witness.c:1089 _rw_enter(3a79d64a42e02c62,60b,fffffd8069b814d8,ffffffff81edebdf) at _rw_enter+0xbf _rrw_enter(664bb1d36b49049,fffffd807cd048d0,ffffffff8139fd50,0) at _rrw_enter+0x5c sys/kern/kern_rwlock.c:410 VOP_LOCK(4ba72e6248c2688,fffffd807cd048d0) at VOP_LOCK+0x55 sys/kern/vfs_vops.c:598 vn_lock(2672bef2adfe611e,1000) at vn_lock+0x6e sys/kern/vfs_vnops.c:549 uvn_io(b16566fb5f30ed38,0,0,fffffd807ccc6378,0) at uvn_io+0x2ca sys/uvm/uvm_vnode.c:1188 uvn_get(ed83b7d756ab5215,ffffffff8146c190,fffffd807ccc6378,fffffd806ae77020,0,5) at uvn_get+0x206 sys/uvm/uvm_vnode.c:1048 uvm_fault(b16566fb5fc4196e,20ffe000,0,5) at uvm_fault+0x12c1 sys/uvm/uvm_fault.c:1023 uvm_fault_wire(c6afa347f5179fde,5,20ffe000,fffffd806ae77020) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1293 uvm_map_pageable_wire(4ba72e624fc61b6,fffffd806ae77020,21000000,20ffc000,0,4) at uvm_map_pageable_wire+0x2fd sys/uvm/uvm_map.c:2258 uvm_map_protect(42f3eb9fc8766654,10,ffff800020b92018,19dc7ae7348,0) at uvm_map_protect+0x610 sys/uvm/uvm_map.c:3294 syscall(2feed8fc51474d56) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(2feed8fc51474d56) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffa4,0,3,19bb884e010) at Xsyscall+0x128 end of kernel end trace frame: 0x19dc7ae73d0, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020c9b230 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800000946000 rax 0xffff800000940d80 r8 0xffffffff817c727f witness_checkorder+0x12cf r9 0x5 r10 0xd0112703d0ad3c62 r11 0x54c2704395d5fb7d r12 0xfffffd80025cdc30 r13 0xffffffff81ebbd52 cmd0646_9_tim_udma+0xc96d r14 0xffffffff8227b740 w_lodata+0x51150 r15 0xffffffff82280440 w_lodata+0x55e50 rip 0xffffffff81107618 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c9b220 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor0) pid=389758 stat=onproc flags process=10 proc=4000000 pri=69, usrpri=69, nice=20 forw=0xffffffffffffffff, list=0xffff800020b924c8,0xffffffff82300be0 process=0xffff800020b94010 user=0xffff800020c96000, vmspace=0xfffffd807f00c9d8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 93125 65032 87031 32767 2 0x10 syz-executor0 *93125 389758 87031 32767 7 0x4000010 syz-executor0 72662 201552 96077 32767 2 0x10 syz-executor1 72662 356323 96077 32767 3 0x4000090 ttyout syz-executor1 96077 449754 92020 32767 3 0x90 nanosleep syz-executor1 87031 497839 87773 32767 3 0x90 nanosleep syz-executor0 92020 350084 90962 0 3 0x82 wait syz-executor1 87773 255994 90962 0 3 0x82 wait syz-executor0 90962 476927 72999 0 3 0x82 thrsleep syz-fuzzer 90962 21264 72999 0 3 0x4000082 thrsleep syz-fuzzer 90962 192396 72999 0 3 0x4000082 thrsleep syz-fuzzer 90962 462843 72999 0 3 0x4000082 thrsleep syz-fuzzer 90962 158257 72999 0 3 0x4000082 thrsleep syz-fuzzer 90962 161521 72999 0 3 0x4000082 kqread syz-fuzzer 90962 114809 72999 0 3 0x4000082 thrsleep syz-fuzzer 90962 271219 72999 0 3 0x4000082 thrsleep syz-fuzzer 90962 376910 72999 0 3 0x4000082 thrsleep syz-fuzzer 90962 425301 72999 0 3 0x4000082 thrsleep syz-fuzzer 72999 465811 23908 0 3 0x10008a pause ksh 23908 305281 99088 0 3 0x92 select sshd 62962 352534 1 0 3 0x100083 ttyin getty 99088 387861 1 0 3 0x80 select sshd 16948 513833 64281 73 7 0x100090 syslogd 64281 68571 1 0 3 0x100082 netio syslogd 34872 316003 1 77 3 0x100090 poll dhclient 5962 166757 1 0 3 0x80 poll dhclient 31083 162455 0 0 2 0x14200 zerothread 37285 226620 0 0 3 0x14200 aiodoned aiodoned 29621 413566 0 0 3 0x14200 syncer update 32777 249515 0 0 3 0x14200 cleaner cleaner 43985 129908 0 0 3 0x14200 reaper reaper 61174 493481 0 0 3 0x14200 pgdaemon pagedaemon 27495 98192 0 0 3 0x14200 bored crynlk 71056 402134 0 0 3 0x14200 bored crypto 44105 222360 0 0 3 0x40014200 acpi0 acpi0 9666 445747 0 0 3 0x40014200 idle1 646 337099 0 0 3 0x14200 bored softnet 36189 178268 0 0 3 0x14200 bored systqmp 41756 381949 0 0 3 0x14200 bored systq 9600 86883 0 0 3 0x40014200 bored softclock 78019 465291 0 0 3 0x40014200 idle0 1 445089 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper