Messages in this thread |  | | Subject | Re: BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:49 | From | Heiner Kallweit <> | Date | Fri, 27 Mar 2020 10:46:09 +0100 |
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On 27.03.2020 09:46, Hillf Danton wrote: > > On Fri, 27 Mar 2020 00:56:34 +0100 Heiner Kallweit wrote: >> >> I just got the following on linux-next from March 25th. You dealt last with >> include/linux/percpu-rwsem.h, so you may have an idea where to look for the >> root cause. >> >> >> Mar 26 23:29:51 zotac kernel: BUG: kernel NULL pointer dereference, address: 0000000000000000 >> Mar 26 23:29:51 zotac kernel: #PF: supervisor read access in kernel mode >> Mar 26 23:29:51 zotac kernel: #PF: error_code(0x0000) - not-present page >> Mar 26 23:29:51 zotac kernel: PGD 0 P4D 0 >> Mar 26 23:29:51 zotac kernel: Oops: 0000 [#1] SMP >> Mar 26 23:29:51 zotac kernel: CPU: 2 PID: 2404 Comm: resolvconf Not tainted 5.6.0-rc7-next-20200325+ #1 >> Mar 26 23:29:51 zotac kernel: Hardware name: NA ZBOX-CI327NANO-GS-01/ZBOX-CI327NANO-GS-01, BIOS 5.12 04/26/2018 >> Mar 26 23:29:51 zotac kernel: RIP: 0010:link_path_walk.part.0+0x1c5/0x350 >> Mar 26 23:29:51 zotac kernel: Code: 41 83 ef 01 31 f6 4c 89 f7 49 63 c7 48 8d 04 40 48 c1 e0 04 49 03 46 58 4c 8b 68 20 e8 84 fc ff ff 48 85 c0 75 5f 49 8b 46 08 <8b> 00 25 00 00 70 00 3d 00 00 20 00 0f 84 a5 fe ff ff 41 f6 46 38 >> Mar 26 23:29:51 zotac kernel: RSP: 0018:ffffb272403c7ba8 EFLAGS: 00010246 >> Mar 26 23:29:51 zotac kernel: RAX: 0000000000000000 RBX: fefefefefefefeff RCX: 0000000000000000 >> Mar 26 23:29:51 zotac kernel: RDX: ffff9f21bab88000 RSI: ffffffffbea46aa0 RDI: ffff9f21bab88858 >> Mar 26 23:29:51 zotac kernel: RBP: ffffb272403c7bf0 R08: 0000000000000001 R09: 0000000000000000 >> Mar 26 23:29:51 zotac kernel: R10: 80800000007fffff R11: 0000000000000000 R12: 2f2f2f2f2f2f2f2f >> Mar 26 23:29:51 zotac kernel: R13: ffff9f21b9476243 R14: ffffb272403c7c30 R15: 0000000000000001 >> Mar 26 23:29:51 zotac kernel: FS: 00007f464ebc8b80(0000) GS:ffff9f21bbd00000(0000) knlGS:0000000000000000 >> Mar 26 23:29:51 zotac kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> Mar 26 23:29:51 zotac kernel: CR2: 0000000000000000 CR3: 0000000178b7d000 CR4: 00000000003406e0 >> Mar 26 23:29:51 zotac kernel: Call Trace: >> Mar 26 23:29:51 zotac kernel: path_lookupat.isra.0+0x3b/0x150 >> Mar 26 23:29:51 zotac kernel: filename_lookup+0xb4/0x140 >> Mar 26 23:29:51 zotac kernel: ? rcu_read_lock_sched_held+0x4a/0x80 >> Mar 26 23:29:51 zotac kernel: ? kmem_cache_alloc+0x24c/0x280 >> Mar 26 23:29:51 zotac kernel: kern_path+0x31/0x40 >> Mar 26 23:29:51 zotac kernel: unix_find_other+0x4f/0x2b0 >> Mar 26 23:29:51 zotac kernel: unix_stream_connect+0x115/0x6c4 >> Mar 26 23:29:51 zotac kernel: __sys_connect+0xec/0x110 >> Mar 26 23:29:51 zotac kernel: ? lockdep_hardirqs_on+0xf2/0x1a0 >> Mar 26 23:29:51 zotac kernel: __x64_sys_connect+0x19/0x20 >> Mar 26 23:29:51 zotac kernel: do_syscall_64+0x50/0x1e0 >> Mar 26 23:29:51 zotac kernel: entry_SYSCALL_64_after_hwframe+0x49/0xb3 > > FYI: another null-ptr-deref was reported at > > https://lore.kernel.org/lkml/4CBDE0F3-FB73-43F3-8535-6C75BA004233@lca.pw/ > > and fix in that thread. > Thanks for the quick feedback and the hint!
Heiner
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