Hello,
I got the following warning from an UML guest (32 bit Gentoo Linux, linux-v3.7-11091-gf01af9f)
and wonder now whether this worth to be reported to the LKML or not :
* Starting local
[ ok ]
------------[ cut here ]------------
WARNING: at kernel/mutex-debug.c:65 mutex_remove_waiter+0xbe/0xf0()
39667d3c: [<0833b538>] dump_stack+0x22/0x24
39667d54: [<0807d61a>] warn_slowpath_common+0x5a/0x80
39667d7c: [<0807d6e3>] warn_slowpath_null+0x23/0x30
39667d8c: [<080b2cde>] mutex_remove_waiter+0xbe/0xf0
39667da4: [<0833f1c6>] __mutex_lock_slowpath+0x1d6/0x210
39667ddc: [<0833f212>] mutex_lock+0x12/0x30
39667df0: [<081394f5>] ep_scan_ready_list.isra.21+0x25/0x160
39667e28: [<0813a379>] sys_epoll_wait+0x319/0x400
39667eac: [<08062af2>] handle_syscall+0x82/0xb0
39667ef4: [<08074f3d>] userspace+0x46d/0x590
39667fec: [<0805f7cc>] fork_handler+0x6c/0x70
39667ffc: [<00000000>] 0x0
---[ end trace 91e04670b2a3768e ]---
EIP: 0073:[<0000014a>] CPU: 0 Tainted: G W ESP: 007b:083ee1be EFLAGS: 00010286
Tainted: G W
EAX: 00008282 EBX: 08409788 ECX: 08409788 EDX: 084003c0
ESI: 083feb0c EDI: 083feba0 EBP: 083f64db DS: 007b ES: 007b
083fe74c: [<0807978f>] show_regs+0x10f/0x120
083fe768: [<08061f72>] segv+0x62/0x2b0
083fe818: [<08062233>] segv_handler+0x73/0x80
083fe840: [<08071af8>] sig_handler_common+0xb8/0xe0
083feac4: [<08071c3d>] sig_handler+0x3d/0x50
083fead4: [<0807178b>] hard_handler+0x6b/0xa0
083feafc: [<b77bb40c>] 0xb77bb40c
Kernel panic - not syncing: Segfault with no mm
083fe728: [<0833b538>] dump_stack+0x22/0x24
083fe740: [<0833b5b4>] panic+0x7a/0x18b
083fe768: [<08061f7e>] segv+0x6e/0x2b0
083fe818: [<08062233>] segv_handler+0x73/0x80
083fe840: [<08071af8>] sig_handler_common+0xb8/0xe0
083feac4: [<08071c3d>] sig_handler+0x3d/0x50
083fead4: [<0807178b>] hard_handler+0x6b/0xa0
083feafc: [<b77bb40c>] 0xb77bb40c
EIP: 0073:[<b77bb424>] CPU: 0 Tainted: G W ESP: 007b:bfab4cb4 EFLAGS: 00000286
Tainted: G W
EAX: 00000000 EBX: 00002c46 ECX: 00000013 EDX: 00002c46
ESI: 00002c42 EDI: bfab4d48 EBP: bfab4ce8 DS: 007b ES: 007b
083fe6dc: [<0807978f>] show_regs+0x10f/0x120
083fe6f8: [<0806259c>] panic_exit+0x2c/0x50
083fe708: [<0809e158>] notifier_call_chain+0x38/0x60
083fe730: [<0809e2a3>] atomic_notifier_call_chain+0x23/0x30
083fe740: [<0833b5dc>] panic+0xa2/0x18b
083fe768: [<08061f7e>] segv+0x6e/0x2b0
083fe818: [<08062233>] segv_handler+0x73/0x80
083fe840: [<08071af8>] sig_handler_common+0xb8/0xe0
083feac4: [<08071c3d>] sig_handler+0x3d/0x50
083fead4: [<0807178b>] hard_handler+0x6b/0xa0
083feafc: [<b77bb40c>] 0xb77bb40c
--
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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