Messages in this thread |  | | | Date | Sat, 29 Nov 2003 19:00:31 +0200 | | Subject | Re: PROBLEM: 2.6test11 kernel panic on "head -1 /proc/net/tcp" | | From | lkml-031128@amos ... |
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OGAWA Hirofumi wrote: > lkml-031128@amos.mailshell.com writes: > > >>"bad: scheduling while atomic! >>Call Trace: >> schedule+0x55d/0x570 > > > Does this patch fix this problem? > > diff -puN net/ipv4/tcp_ipv4.c~tcp_seq-oops-fix net/ipv4/tcp_ipv4.c > --- linux-2.6.0-test11/net/ipv4/tcp_ipv4.c~tcp_seq-oops-fix 2003-11-29 00:52:15.000000000 +0900 > +++ linux-2.6.0-test11-hirofumi/net/ipv4/tcp_ipv4.c 2003-11-29 00:52:28.000000000 +0900 > @@ -2356,6 +2356,7 @@ static void *tcp_get_idx(struct seq_file > static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) > { > struct tcp_iter_state* st = seq->private; > + st->state = TCP_SEQ_STATE_LISTENING; > st->num = 0; > return *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; > } > > _
Partially. It seems to trigger ppp failure later.
What I do to test this:
1. Compiled a pre-emptive kernel with nothing different in the config and the code except that I added your patch.
2. Boot to single user mode as before.
3. "cat /proc/net/tcp" runs fine.
4. "head -1 /proc/net/tcp" runs fine (it used to freeze with an oops, as described in my original message).
5. I logout from single user mode and let the system boot to multi-user.
This gives me tons of messages like the following:
Badness in local_bh_enable at kernel/softirq.c:121 Call Trace: [<c011df25>] local_bh_enable+0x85/0x90 [<c02315e2>] ppp_async_push+0xa2/0x180 [<c0230efd>] ppp_asynctty_wakeup+0x2d/0x60 [<c0202638>] pty_unthrottle+0x58/0x60 [<c01ff0fd>] check_unthrottle+0x3d/0x40 [<c01ff1a3>] n_tty_flush_buffer+0x13/0x60 [<c0202a47>] pty_flush_buffer+0x67/0x70 [<c01fba41>] do_tty_hangup+0x3f1/0x460 [<c01fcfbc>] release_dev+0x62c/0x660 [<c013dfab>] zap_pmd_range+0x4b/0x70 [<c013e013>] unmap_page_range+0x43/0x70 [<c01622a2>] dput+0x22/0x210 [<c01fd38a>] tty_release+0x2a/0x60 [<c014ccf8>] __fput+0x108/0x120 [<c014b359>] filp_close+0x59/0x90 [<c011b874>] put_files_struct+0x54/0xc0 [<c011c47d>] do_exit+0x15d/0x3e0 [<c011c79a>] do_group_exit+0x3a/0xb0 [<c01091b7>] syscall_call+0x7/0xb
PPP fails. Re-run "pon adsl-provider" or "/etc/init.d/ppp start" fails. What I get on such attempts are messages in /var/log/messages like:
Nov 29 18:48:57 picton kernel: Badness in local_bh_enable at kernel/softirq.c:121 Nov 29 18:48:57 picton kernel: Call Trace: Nov 29 18:48:57 picton kernel: [local_bh_enable+133/144] local_bh_enable+0x85/0x90 Nov 29 18:48:57 picton kernel: [ppp_async_push+162/384] ppp_async_push+0xa2/0x180 Nov 29 18:48:57 picton kernel: [ppp_asynctty_wakeup+45/96] ppp_asynctty_wakeup+0x2d/0x60 Nov 29 18:48:57 picton kernel: [pty_unthrottle+88/96] pty_unthrottle+0x58/0x60 Nov 29 18:48:57 picton kernel: [check_unthrottle+61/64] check_unthrottle+0x3d/0x40 Nov 29 18:48:57 picton kernel: [n_tty_flush_buffer+19/96] n_tty_flush_buffer+0x13/0x60 Nov 29 18:48:57 picton kernel: [pty_flush_buffer+103/112] pty_flush_buffer+0x67/0x70 Nov 29 18:48:57 picton kernel: [do_tty_hangup+1009/1120] do_tty_hangup+0x3f1/0x460 Nov 29 18:48:57 picton kernel: [release_dev+1580/1632] release_dev+0x62c/0x660 Nov 29 18:48:57 picton kernel: [zap_pmd_range+75/112] zap_pmd_range+0x4b/0x70 Nov 29 18:48:57 picton kernel: [unmap_page_range+67/112] unmap_page_range+0x43/0x70 Nov 29 18:48:57 picton kernel: [dput+34/528] dput+0x22/0x210 Nov 29 18:48:57 picton kernel: [tty_release+42/96] tty_release+0x2a/0x60 Nov 29 18:48:57 picton kernel: [__fput+264/288] __fput+0x108/0x120 Nov 29 18:48:57 picton kernel: [filp_close+89/144] filp_close+0x59/0x90 Nov 29 18:48:57 picton kernel: [put_files_struct+84/192] put_files_struct+0x54/0xc0 Nov 29 18:48:57 picton kernel: [do_exit+349/992] do_exit+0x15d/0x3e0 Nov 29 18:48:57 picton kernel: [do_group_exit+58/176] do_group_exit+0x3a/0xb0 Nov 29 18:48:57 picton kernel: [syscall_call+7/11] syscall_call+0x7/0xb Nov 29 18:48:57 picton kernel: Nov 29 18:48:57 picton pppd[32717]: Modem hangup Nov 29 18:48:57 picton pppd[32717]: Connection terminated. Nov 29 18:48:57 picton pppd[32717]: Exit.
Ksymoops doesn't seem to add much useful data, here is what I get from it:
Trace; c011df25 <local_bh_enable+85/90> Trace; c02315e2 <ppp_async_push+a2/180> Trace; c0230efd <ppp_asynctty_wakeup+2d/60> Trace; c0202638 <pty_unthrottle+58/60> Trace; c01ff0fd <check_unthrottle+3d/40> Trace; c01ff1a3 <n_tty_flush_buffer+13/60> Trace; c0202a47 <pty_flush_buffer+67/70> Trace; c01fba41 <do_tty_hangup+3f1/460> Trace; c01fcfbc <release_dev+62c/660> Trace; c013dfab <zap_pmd_range+4b/70> Trace; c013e013 <unmap_page_range+43/70> Trace; c01622a2 <dput+22/210> Trace; c01fd38a <tty_release+2a/60> Trace; c014ccf8 <__fput+108/120> Trace; c014b359 <filp_close+59/90> Trace; c011b874 <put_files_struct+54/c0> Trace; c011c47d <do_exit+15d/3e0> Trace; c011c79a <do_group_exit+3a/b0> Trace; c01091b7 <syscall_call+7/b>
If I avoid doing the "head -1 /proc/net/tcp" in single user then PPP works.
Thanks,
--Amos
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