Date: Sat, 23 May 2026 21:26:22 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 295529] lock order reversal vm_map and proctree Message-ID: <bug-295529-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295529 Bug ID: 295529 Summary: lock order reversal vm_map and proctree Product: Base System Version: 16.0-CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: jfc@mit.edu While running poudriere in a 16-CURRENT (464a351267dc) system running in bhyve on a 14.4-STABLE amd64 host I saw the following on the console. [00:01:30] [02] [00:00:00] Building textproc/py-toml@py312 | py312-toml-0.10.2_1 lock order reversal: 1st 0xfffff801ad799980 vm map (user) (vm map (user), sx) @ /usr/src/sys/vm/vm_map.c:5067 2nd 0xffffffff81a019c0 proctree (proctree, sx) @ /usr/src/sys/kern/subr_prf.c:185 All lock orders from proctree -> vm map (user): "proctree" -> "allproc" -> "allprison" -> "osd_module" -> "sysvshmsx" -> "vm map (user)" hardcoded lock order "proctree"(sx) -> "allproc"(sx) first seen at: (No stack trace) hardcoded lock order "allproc"(sx) -> "allprison"(sx) first seen at: (No stack trace) lock order "allprison"(sx) -> "osd_module"(sx) first seen at: #0 0xffffffff80c2f16b at witness_checkorder+0x35b #1 0xffffffff80bc1634 at _sx_slock_int+0x64 #2 0xffffffff80b92944 at osd_call+0x54 #3 0xffffffff80b6c80c at kern_jail_set+0x20dc #4 0xffffffff80b6dc9f at sys_jail_set+0x3f #5 0xffffffff8110ba08 at amd64_syscall+0x168 #6 0xffffffff810db0ab at fast_syscall_common+0xf8 lock order "osd_module"(sx) -> "sysvshmsx"(sx) first seen at: #0 0xffffffff80c2f16b at witness_checkorder+0x35b #1 0xffffffff80bc0530 at _sx_xlock+0x60 #2 0xffffffff80c4dec7 at shm_prison_remove+0x27 #3 0xffffffff80b929a2 at osd_call+0xb2 #4 0xffffffff80b6fd4c at prison_deref+0x5dc #5 0xffffffff80b71837 at sys_jail_remove+0x1a7 #6 0xffffffff8110ba08 at amd64_syscall+0x168 #7 0xffffffff810db0ab at fast_syscall_common+0xf8 lock order "sysvshmsx"(sx) -> "vm map (user)"(sx) first seen at: #0 0xffffffff80c2f16b at witness_checkorder+0x35b #1 0xffffffff80bc1634 at _sx_slock_int+0x64 #2 0xffffffff80f97a40 at vm_map_lookup+0x80 #3 0xffffffff80f87ddf at vm_fault+0x12f #4 0xffffffff80f87b55 at vm_fault_trap+0x65 #5 0xffffffff8110b1a4 at trap_pfault+0x274 #6 0xffffffff810da7b8 at calltrap+0x8 #7 0xffffffff80bc6f56 at sysctl_old_user+0xa6 #8 0xffffffff80c4d290 at sysctl_shmsegs+0x2c0 #9 0xffffffff80bc783c at sysctl_root_handler_locked+0x9c #10 0xffffffff80bc6ba3 at sysctl_root+0x233 #11 0xffffffff80bc72a6 at userland_sysctl+0x1b6 #12 0xffffffff80bc7637 at kern___sysctlbyname+0x227 #13 0xffffffff80bc767d at sys___sysctlbyname+0x2d #14 0xffffffff8110ba08 at amd64_syscall+0x168 #15 0xffffffff810db0ab at fast_syscall_common+0xf8 lock order vm map (user) -> proctree attempted at: #0 0xffffffff80c2faa7 at witness_checkorder+0xc97 #1 0xffffffff80bc1634 at _sx_slock_int+0x64 #2 0xffffffff80c10a54 at uprintf+0x64 #3 0xffffffff80f98234 at vm_map_lookup+0x874 #4 0xffffffff80f87ddf at vm_fault+0x12f #5 0xffffffff80f87b55 at vm_fault_trap+0x65 #6 0xffffffff8110b1a4 at trap_pfault+0x274 #7 0xffffffff8110a7f0 at trap+0x3d0 #8 0xffffffff810da7b8 at calltrap+0x8 [00:01:39] [02] [00:00:09] Finished textproc/py-toml@py312 | py312-toml-0.10.2_1: Success -- You are receiving this mail because: You are the assignee for the bug.home | help
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