Description of Problem: I had logged in with a SecureCRT SSH session as admin. Then, I "su -" as root and installed some data files to my web server. When I exited from my root session, the system crashed. Syslog gives: ------------------------------------ Apr 11 03:35:57 im-14c su(pam_unix)[20021]: session closed for user root Apr 11 03:35:57 im-14c kernel: Assertion failure in unmap_underlying_metadata() at buffer.c:1538: "!buffer_jlist_eq(old_bh, 3)" Apr 11 03:35:57 im-14c kernel: ------------[ cut here ]------------ Apr 11 03:35:57 im-14c kernel: kernel BUG at buffer.c:1538! Apr 11 03:35:57 im-14c kernel: invalid operand: 0000 Apr 11 03:35:57 im-14c kernel: CPU: 0 Apr 11 03:35:57 im-14c kernel: EIP: 0010: [unmap_underlying_metadata+180/256] Not tainted Apr 11 03:35:57 im-14c kernel: EIP: 0010:[<c0138d24>] Not tainted Apr 11 03:35:57 im-14c kernel: EFLAGS: 00010282 Apr 11 03:35:57 im-14c kernel: EIP is at unmap_underlying_metadata [kernel] 0xb4 Apr 11 03:35:57 im-14c kernel: eax: 0000001d ebx: ca427480 ecx: 00000001 edx: 0000c8bb Apr 11 03:35:57 im-14c kernel: esi: dfebbec0 edi: 00001000 ebp: 00000000 esp: c475fe38 Apr 11 03:35:57 im-14c kernel: ds: 0018 es: 0018 ss: 0018 Apr 11 03:35:57 im-14c kernel: Process bash (pid: 20027, stackpage=c475f000) Apr 11 03:35:57 im-14c kernel: Stack: c022e016 00000602 00000001 00001000 00001000 c01390d1 00000000 00001000 Apr 11 03:35:57 im-14c kernel: c01390f2 ca427480 ca427480 dccbb000 c475fe78 00001000 00000000 ca427480 Apr 11 03:35:57 im-14c kernel: 00000001 00000070 00000014 e0806467 00000014 00000070 c17a61bc d519f200 Apr 11 03:35:57 im-14c kernel: Call Trace: [IRQ0x0f_interrupt+113814/138400] .rodata.str1.1 [kernel] 0x2511 Apr 11 03:35:57 im-14c kernel: Call Trace: [<c022e016>] .rodata.str1.1 [kernel] 0x2511 Apr 11 03:35:57 im-14c kernel: [__block_prepare_write+273/768] __block_prepare_write [kernel] 0x111 Apr 11 03:35:57 im-14c kernel: [<c01390d1>] __block_prepare_write [kernel] 0x111 Apr 11 03:35:57 im-14c kernel: [__block_prepare_write+306/768] __block_prepare_write [kernel] 0x132 Apr 11 03:35:57 im-14c kernel: [<c01390f2>] __block_prepare_write [kernel] 0x132 Apr 11 03:35:57 im-14c kernel: [8139too:__insmod_8139too_O/lib/modules/2.4.9- 21/kernel/drivers/net/+-519065/96] journal_blocks_per_p Apr 11 03:35:57 im-14c kernel: [<e0806467>] journal_blocks_per_page_Rc38911b3 [jbd] 0x77 Apr 11 03:35:57 im-14c kernel: [block_prepare_write+34/112] block_prepare_write [kernel] 0x22 Apr 11 03:35:57 im-14c kernel: [<c01399b2>] block_prepare_write [kernel] 0x22 Apr 11 03:35:57 im-14c kernel: [8139too:__insmod_8139too_O/lib/modules/2.4.9- 21/kernel/drivers/net/+-481072/96] __insmod_ext3_S.text Apr 11 03:35:57 im-14c kernel: [<e080f8d0>] __insmod_ext3_S.text_L43040 [ext3] 0x3870 Apr 11 03:35:57 im-14c kernel: [8139too:__insmod_8139too_O/lib/modules/2.4.9- 21/kernel/drivers/net/+-479859/96] __insmod_ext3_S.text Apr 11 03:35:57 im-14c kernel: [<e080fd8d>] __insmod_ext3_S.text_L43040 [ext3] 0x3d2d Apr 11 03:35:57 im-14c kernel: [8139too:__insmod_8139too_O/lib/modules/2.4.9- 21/kernel/drivers/net/+-481072/96] __insmod_ext3_S.text Apr 11 03:35:57 im-14c kernel: [<e080f8d0>] __insmod_ext3_S.text_L43040 [ext3] 0x3870 Apr 11 03:35:57 im-14c kernel: [generic_file_write+972/1552] generic_file_write [kernel] 0x3cc Apr 11 03:35:57 im-14c kernel: [<c012aadc>] generic_file_write [kernel] 0x3cc Apr 11 03:35:57 im-14c kernel: [dentry_open+195/320] dentry_open [kernel] 0xc3 Apr 11 03:35:57 im-14c kernel: [<c0135f43>] dentry_open [kernel] 0xc3 Apr 11 03:35:57 im-14c kernel: [8139too:__insmod_8139too_O/lib/modules/2.4.9- 21/kernel/drivers/net/+-488958/96] __insmod_ext3_S.text Apr 11 03:35:57 im-14c kernel: [<e080da02>] __insmod_ext3_S.text_L43040 [ext3] 0x19a2 Apr 11 03:35:57 im-14c kernel: [sys_write+150/208] sys_write [kernel] 0x96 Apr 11 03:35:57 im-14c kernel: [<c0136736>] sys_write [kernel] 0x96 Apr 11 03:35:57 im-14c kernel: [sys_open+125/176] sys_open [kernel] 0x7d Apr 11 03:35:57 im-14c kernel: [<c013618d>] sys_open [kernel] 0x7d Apr 11 03:35:57 im-14c kernel: [system_call+51/56] system_call [kernel] 0x33 Apr 11 03:35:57 im-14c kernel: [<c0106f3b>] system_call [kernel] 0x33 Apr 11 03:35:57 im-14c kernel: Apr 11 03:35:57 im-14c kernel: Apr 11 03:35:57 im-14c kernel: Code: 0f 0b 59 5b b8 01 00 00 00 0f b3 46 18 19 c0 85 c0 74 07 56 Version-Release number of selected component (if applicable): How Reproducible: I do not know how to reproduce this crash. Steps to Reproduce: 1. 2. 3. Actual Results: Expected Results: Additional Information:
Which kernel version?
Kernel version is 2.4.9-21
I _think_ -21 has all the recent relevant fixes in place, but upgrading to 2.4.9-31 cannot hurt. Other than that, I can only suggest running memtest86 and checking your logs for other errors. If this is a non-reproducible one-off fault that nobody else has seen, chances are that it is most likely a hardware fault, and if it's not, we'll definitely need more info than is present here to trace it further. Please reopen the bug if anything else comes to light.