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    Subjectsync segfaults (2.2.0-pre*)

    Hi there!

    Our machine, running 2.2.0-pre1 and later pre4 behaves strange after a
    couple of hours of uptime. When running sync(1) or e2fsck, it dumps its
    registers, the process exits with segfault, and the system keeps on
    running. Everything else sems to work alright.
    I send the kernel messages in attachment.

    The machine is:
    PII klamath, 233MHz, libc5.4.46, gcc 2.7.2.1,
    swap total: 133885952 (on one partition)
    (shall I send other info?)

    Good luck!
    Egmont Koblinger
    Dec 30 16:44:39 pingvin kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000024
    Dec 30 16:44:39 pingvin kernel: current->tss.cr3 = 02908000, Xr3 = 02908000
    Dec 30 16:44:39 pingvin kernel: *pde = 00000000
    Dec 30 16:44:39 pingvin kernel: Oops: 0000
    Dec 30 16:44:39 pingvin kernel: CPU: 0
    Dec 30 16:44:39 pingvin kernel: EIP: 0010:[<c01326ee>]
    Dec 30 16:44:39 pingvin kernel: EFLAGS: 00010296
    Dec 30 16:44:39 pingvin kernel: eax: c2b60004 ebx: c2a49b00 ecx: 00000000 edx: 00000000
    Dec 30 16:44:39 pingvin kernel: esi: c2a49aa0 edi: 4000ffff ebp: bfff0000 esp: c2931f70
    Dec 30 16:44:39 pingvin kernel: ds: 0018 es: 0018 ss: 0018
    Dec 30 16:44:39 pingvin kernel: Process sync (pid: 3945, process nr: 108, stackpage=c2931000)
    Dec 30 16:44:39 pingvin kernel: Stack: 4000ffff bfff0000 c2e8fea8 c01ca980 c0132982 c2a49b00 00000000 00000000
    Dec 30 16:44:39 pingvin kernel: 400061cc bffffe48 c01242d2 00000000 ffffffff 00000000 00000000 00000000
    Dec 30 16:44:39 pingvin kernel: 00000000 c2930000 c01242e7 00000000 c0108914 00000000 00000001 00000000
    Dec 30 16:44:39 pingvin kernel: Call Trace: [<c0132982>] [<c01242d2>] [<c01242e7>] [<c0108914>]
    Dec 30 16:44:39 pingvin kernel: Code: 8b 74 91 24 f6 43 2c 01 74 09 53 e8 52 ff ff ff 83 c4 04 80

    Dec 30 16:46:43 pingvin kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000024
    Dec 30 16:46:43 pingvin kernel: current->tss.cr3 = 02908000, Xr3 = 02908000
    Dec 30 16:46:43 pingvin kernel: *pde = 00000000
    Dec 30 16:46:43 pingvin kernel: Oops: 0000
    Dec 30 16:46:43 pingvin kernel: CPU: 0
    Dec 30 16:46:43 pingvin kernel: EIP: 0010:[<c01326ee>]
    Dec 30 16:46:43 pingvin kernel: EFLAGS: 00010296
    Dec 30 16:46:43 pingvin kernel: eax: c2b60004 ebx: c2a49b00 ecx: 00000000 edx: 00000000
    Dec 30 16:46:43 pingvin kernel: esi: c2a49aa0 edi: 4000ffff ebp: bfff0000 esp: c0971f70
    Dec 30 16:46:43 pingvin kernel: ds: 0018 es: 0018 ss: 0018
    Dec 30 16:46:43 pingvin kernel: Process sync (pid: 3974, process nr: 108, stackpage=c0971000)
    Dec 30 16:46:43 pingvin kernel: Stack: 4000ffff bfff0000 c39b2c90 c01ca980 c0132982 c2a49b00 00000000 00000000
    Dec 30 16:46:43 pingvin kernel: 400061cc bffff858 c01242d2 00000000 ffffffff 00000000 00000000 00000000
    Dec 30 16:46:43 pingvin kernel: 00000000 c0970000 c01242e7 00000000 c0108914 00000000 00000001 00000000
    Dec 30 16:46:43 pingvin kernel: Call Trace: [<c0132982>] [<c01242d2>] [<c01242e7>] [<c0108914>]
    Dec 30 16:46:43 pingvin kernel: Code: 8b 74 91 24 f6 43 2c 01 74 09 53 e8 52 ff ff ff 83 c4 04 80

    Dec 30 16:46:49 pingvin kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000024
    Dec 30 16:46:49 pingvin kernel: current->tss.cr3 = 02908000, Xr3 = 02908000
    Dec 30 16:46:49 pingvin kernel: *pde = 00000000
    Dec 30 16:46:49 pingvin kernel: Oops: 0000
    Dec 30 16:46:49 pingvin kernel: CPU: 0
    Dec 30 16:46:49 pingvin kernel: EIP: 0010:[<c01326ee>]
    Dec 30 16:46:49 pingvin kernel: EFLAGS: 00010296
    Dec 30 16:46:49 pingvin kernel: eax: c2b60004 ebx: c2a49b00 ecx: 00000000 edx: 00000000
    Dec 30 16:46:49 pingvin kernel: esi: c2a49aa0 edi: 4000ffff ebp: bfff0000 esp: c0971f70
    Dec 30 16:46:49 pingvin kernel: ds: 0018 es: 0018 ss: 0018
    Dec 30 16:46:49 pingvin kernel: Process sync (pid: 3975, process nr: 108, stackpage=c0971000)
    Dec 30 16:46:49 pingvin kernel: Stack: 4000ffff bfff0000 c2e8fea8 c01ca980 c0132982 c2a49b00 00000000 00000000
    Dec 30 16:46:49 pingvin kernel: 400061cc bffff858 c01242d2 00000000 ffffffff 00000000 00000000 00000000
    Dec 30 16:46:49 pingvin kernel: 00000000 c0970000 c01242e7 00000000 c0108914 00000000 00000001 00000000
    Dec 30 16:46:49 pingvin kernel: Call Trace: [<c0132982>] [<c01242d2>] [<c01242e7>] [<c0108914>]
    Dec 30 16:46:49 pingvin kernel: Code: 8b 74 91 24 f6 43 2c 01 74 09 53 e8 52 ff ff ff 83 c4 04 80

    Dec 30 16:48:24 pingvin kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000024
    Dec 30 16:48:24 pingvin kernel: current->tss.cr3 = 02908000, Xr3 = 02908000
    Dec 30 16:48:24 pingvin kernel: *pde = 00000000
    Dec 30 16:48:24 pingvin kernel: Oops: 0000
    Dec 30 16:48:24 pingvin kernel: CPU: 0
    Dec 30 16:48:24 pingvin kernel: EIP: 0010:[<c01326ee>]
    Dec 30 16:48:24 pingvin kernel: EFLAGS: 00010296
    Dec 30 16:48:24 pingvin kernel: eax: c2b60004 ebx: c2a49b00 ecx: 00000000 edx: 00000000
    Dec 30 16:48:24 pingvin kernel: esi: c2a49aa0 edi: 4000ffff ebp: bfff0000 esp: c3741f70
    Dec 30 16:48:24 pingvin kernel: ds: 0018 es: 0018 ss: 0018
    Dec 30 16:48:24 pingvin kernel: Process sync (pid: 4082, process nr: 108, stackpage=c3741000)
    Dec 30 16:48:24 pingvin kernel: Stack: 4000ffff bfff0000 c2e8fea8 c01ca980 c0132982 c2a49b00 00000000 00000000
    Dec 30 16:48:24 pingvin kernel: 400061cc bffffe48 c01242d2 00000000 ffffffff 00000000 00000000 00000000
    Dec 30 16:48:24 pingvin kernel: 00000000 c3740000 c01242e7 00000000 c0108914 00000000 00000001 00000000
    Dec 30 16:48:24 pingvin kernel: Call Trace: [<c0132982>] [<c01242d2>] [<c01242e7>] [<c0108914>]
    Dec 30 16:48:24 pingvin kernel: Code: 8b 74 91 24 f6 43 2c 01 74 09 53 e8 52 ff ff ff 83 c4 04 80

    Dec 30 19:35:03 pingvin kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000024
    Dec 30 19:35:03 pingvin kernel: current->tss.cr3 = 018b1000, Xr3 = 018b1000
    Dec 30 19:35:03 pingvin kernel: *pde = 00000000
    Dec 30 19:35:03 pingvin kernel: Oops: 0000
    Dec 30 19:35:03 pingvin kernel: CPU: 0
    Dec 30 19:35:03 pingvin kernel: EIP: 0010:[<c01326ee>]
    Dec 30 19:35:03 pingvin kernel: EFLAGS: 00010296
    Dec 30 19:35:03 pingvin kernel: eax: c0a80004 ebx: c2a49b00 ecx: 00000000 edx: 00000000
    Dec 30 19:35:03 pingvin kernel: esi: c2a49aa0 edi: 0805ffff ebp: bfff0000 esp: c089ff70
    Dec 30 19:35:03 pingvin kernel: ds: 0018 es: 0018 ss: 0018
    Dec 30 19:35:03 pingvin kernel: Process e2fsck (pid: 6501, process nr: 109, stackpage=c089f000)
    Dec 30 19:35:03 pingvin kernel: Stack: 0805ffff bfff0000 c3833218 c01ca980 c0132982 c2a49b00 00000000 00000000
    Dec 30 19:35:03 pingvin kernel: 0805ee1c bffff814 c01242d2 00000000 ffffffff 00000000 00000000 00000000
    Dec 30 19:35:03 pingvin kernel: 00000000 c089e000 c01242e7 00000000 c0108914 0000006e 00005401 00000000
    Dec 30 19:35:03 pingvin kernel: Call Trace: [<c0132982>] [<c01242d2>] [<c01242e7>] [<c0108914>]
    Dec 30 19:35:03 pingvin kernel: Code: 8b 74 91 24 f6 43 2c 01 74 09 53 e8 52 ff ff ff 83 c4 04 80

    Jan 5 14:18:15 pingvin kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000024
    Jan 5 14:18:15 pingvin kernel: current->tss.cr3 = 01eba000, Xr3 = 01eba000
    Jan 5 14:18:15 pingvin kernel: *pde = 00000000
    Jan 5 14:18:15 pingvin kernel: Oops: 0000
    Jan 5 14:18:15 pingvin kernel: CPU: 0
    Jan 5 14:18:15 pingvin kernel: EIP: 0010:[<c0131c3e>]
    Jan 5 14:18:15 pingvin kernel: EFLAGS: 00010296
    Jan 5 14:18:15 pingvin kernel: eax: c11f0004 ebx: c1fd3b60 ecx: 00000000 edx: 00000000
    Jan 5 14:18:15 pingvin kernel: esi: c1fd3b00 edi: 4000ffff ebp: bfff0000 esp: c22bff70
    Jan 5 14:18:15 pingvin kernel: ds: 0018 es: 0018 ss: 0018
    Jan 5 14:18:15 pingvin kernel: Process sync (pid: 24255, process nr: 61, stackpage=c22bf000)
    Jan 5 14:18:15 pingvin kernel: Stack: 4000ffff bfff0000 0000a060 00000000 c0131eca c1fd3b60 00000000 00000000
    Jan 5 14:18:15 pingvin kernel: 400061cc bffff688 c0124092 00000000 ffffffff 00000000 00000000 00000000
    Jan 5 14:18:15 pingvin kernel: 00000000 c22be000 c01240a7 00000000 c0108914 00000000 00000001 00000000
    Jan 5 14:18:15 pingvin kernel: Call Trace: [<c0131eca>] [<c0124092>] [<c01240a7>] [<c0108914>]
    Jan 5 14:18:15 pingvin kernel: Code: 8b 74 91 24 f6 43 2c 01 74 09 53 e8 52 ff ff ff 83 c4 04 80

    Jan 5 22:25:49 pingvin kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000024
    Jan 5 22:25:49 pingvin kernel: current->tss.cr3 = 03333000, Xr3 = 03333000
    Jan 5 22:25:49 pingvin kernel: *pde = 00000000
    Jan 5 22:25:49 pingvin kernel: Oops: 0000
    Jan 5 22:25:49 pingvin kernel: CPU: 0
    Jan 5 22:25:49 pingvin kernel: EIP: 0010:[<c0131c3e>]
    Jan 5 22:25:49 pingvin kernel: EFLAGS: 00010296
    Jan 5 22:25:49 pingvin kernel: eax: c1150004 ebx: c22af440 ecx: 00000000 edx: 00000000
    Jan 5 22:25:49 pingvin kernel: esi: c22af3e0 edi: 4000ffff ebp: bfff0000 esp: c3e1bf70
    Jan 5 22:25:49 pingvin kernel: ds: 0018 es: 0018 ss: 0018
    Jan 5 22:25:49 pingvin kernel: Process sync (pid: 26741, process nr: 54, stackpage=c3e1b000)
    Jan 5 22:25:49 pingvin kernel: Stack: 4000ffff bfff0000 c103eb84 c01c9f38 c0131eca c22af440 00000000 00000000
    Jan 5 22:25:49 pingvin kernel: 400061cc bffff518 c0124092 00000000 ffffffff 00000000 00000000 00000000
    Jan 5 22:25:49 pingvin kernel: 00000000 c3e1a000 c01240a7 00000000 c0108914 00000000 00000001 00000000
    Jan 5 22:25:49 pingvin kernel: Call Trace: [<c0131eca>] [<c0124092>] [<c01240a7>] [<c0108914>]
    Jan 5 22:25:49 pingvin kernel: Code: 8b 74 91 24 f6 43 2c 01 74 09 53 e8 52 ff ff ff 83 c4 04 80
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