On Sun, May 17, 2020 at 10:37:22AM -0700, Guenter Roeck wrote: > Hi, > > On Thu, May 07, 2020 at 07:59:58AM -0700, ira.weiny@xxxxxxxxx wrote: > > From: Ira Weiny <ira.weiny@xxxxxxxxx> > > > > To support kmap_atomic_prot(), all architectures need to support > > protections passed to their kmap_atomic_high() function. Pass > > protections into kmap_atomic_high() and change the name to > > kmap_atomic_high_prot() to match. > > > > Then define kmap_atomic_prot() as a core function which calls > > kmap_atomic_high_prot() when needed. > > > > Finally, redefine kmap_atomic() as a wrapper of kmap_atomic_prot() with > > the default kmap_prot exported by the architectures. > > > > Reviewed-by: Christoph Hellwig <hch@xxxxxx> > > Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx> > > This patch causes a variety of crashes whem booting powerpc images in qemu. PowerPC has the same issue as microblaze and sparc. I'm preping a patch with all three fixed which fixes the kunmap_atomic clean up patch... Sorry for not seeing this last night... Hopefully this can explain all the problems. It is clearly a bug. Ira > > There are lots of warnings such as: > > WARNING: CPU: 0 PID: 0 at lib/locking-selftest.c:743 irqsafe1_hard_spin_12+0x50/0xb0 > Modules linked in: > CPU: 0 PID: 0 Comm: swapper Tainted: G W 5.7.0-rc5-next-20200515 #1 > NIP: c0660c7c LR: c0660c44 CTR: c0660c2c > REGS: c1223e68 TRAP: 0700 Tainted: G W (5.7.0-rc5-next-20200515) > MSR: 00021000 <CE,ME> CR: 28000224 XER: 20000000 > > GPR00: c0669c78 c1223f20 c113d560 c0660c44 00000000 00000001 c1223ea8 00000001 > GPR08: 00000000 00000001 0000fffc ffffffff 88000222 00000000 00000000 00000000 > GPR16: 00000000 00000000 00000000 00000000 c0000000 00000000 00000000 c1125084 > GPR24: c1125084 c1230000 c1879538 fffffffc 00000001 00000000 c1011afc c1230000 > NIP [c0660c7c] irqsafe1_hard_spin_12+0x50/0xb0 > LR [c0660c44] irqsafe1_hard_spin_12+0x18/0xb0 > Call Trace: > [c1223f20] [c1880000] megasas_mgmt_info+0xee4/0x1008 (unreliable) > [c1223f40] [c0669c78] dotest+0x38/0x550 > [c1223f70] [c066aa4c] locking_selftest+0x8bc/0x1d54 > [c1223fa0] [c10e0bc8] start_kernel+0x3ec/0x510 > [c1223ff0] [c00003a0] set_ivor+0x118/0x154 > Instruction dump: > 81420000 38e80001 3d4a0001 2c080000 91420000 90e20488 40820008 91020470 > 81290000 5529031e 7d290034 5529d97e <0f090000> 3fe0c11c 3bff3964 3bff00ac > irq event stamp: 588 > hardirqs last enabled at (587): [<c00b9fe4>] vprintk_emit+0x1b4/0x33c > hardirqs last disabled at (588): [<c0660c44>] irqsafe1_hard_spin_12+0x18/0xb0 > softirqs last enabled at (0): [<00000000>] 0x0 > softirqs last disabled at (0): [<00000000>] 0x0 > ---[ end trace b18fe9e172f99d03 ]--- > > This is followed by: > > BUG: sleeping function called from invalid context at lib/mpi/mpi-pow.c:245 > in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 14, name: cryptomgr_test > INFO: lockdep is turned off. > CPU: 0 PID: 14 Comm: cryptomgr_test Tainted: G W 5.7.0-rc5-next-20200515 #1 > Call Trace: > [ce221b58] [c008755c] ___might_sleep+0x280/0x2a8 (unreliable) > [ce221b78] [c06bc524] mpi_powm+0x634/0xc50 > [ce221c38] [c05eafdc] rsa_dec+0x88/0x134 > [ce221c78] [c05f3b40] test_akcipher_one+0x678/0x804 > [ce221dc8] [c05f3d7c] alg_test_akcipher+0xb0/0x130 > [ce221df8] [c05ee674] alg_test.part.0+0xb4/0x458 > [ce221ed8] [c05ed2b0] cryptomgr_test+0x30/0x50 > [ce221ef8] [c007cd74] kthread+0x134/0x170 > [ce221f38] [c001433c] ret_from_kernel_thread+0x14/0x1c > Kernel panic - not syncing: Aiee, killing interrupt handler! > CPU: 0 PID: 14 Comm: cryptomgr_test Tainted: G W 5.7.0-rc5-next-20200515 #1 > Call Trace: > [ce221e08] [c00530fc] panic+0x148/0x34c (unreliable) > [ce221e68] [c0056460] do_exit+0xac0/0xb40 > [ce221eb8] [c00f5be8] find_kallsyms_symbol_value+0x0/0x128 > [ce221ed8] [c05ed2d0] crypto_alg_put+0x0/0x70 > [ce221ef8] [c007cd74] kthread+0x134/0x170 > [ce221f38] [c001433c] ret_from_kernel_thread+0x14/0x1c > > Bisect log is attached. The patch can not easily be reverted since > it results in compile errors. > > Note that similar failures are seen with sparc32 images. Those bisect > to a different patch, but reverting that patch doesn't fix the problem. > The failure pattern (warnings followed by a crash in cryptomgr_test) > is the same. > > Guenter > > --- > # bad: [bdecf38f228bcca73b31ada98b5b7ba1215eb9c9] Add linux-next specific files for 20200515 > # good: [2ef96a5bb12be62ef75b5828c0aab838ebb29cb8] Linux 5.7-rc5 > git bisect start 'HEAD' 'v5.7-rc5' > # good: [3674d7aa7a8e61d993886c2fb7c896c5ef85e988] Merge remote-tracking branch 'crypto/master' > git bisect good 3674d7aa7a8e61d993886c2fb7c896c5ef85e988 > # good: [87f6f21783522e6d62127cf33ae5e95f50874beb] Merge remote-tracking branch 'spi/for-next' > git bisect good 87f6f21783522e6d62127cf33ae5e95f50874beb > # good: [5c428e8277d5d97c85126387d4e00aa5adde4400] Merge remote-tracking branch 'staging/staging-next' > git bisect good 5c428e8277d5d97c85126387d4e00aa5adde4400 > # good: [f68de67ed934e7bdef4799fd7777c86f33f14982] Merge remote-tracking branch 'hyperv/hyperv-next' > git bisect good f68de67ed934e7bdef4799fd7777c86f33f14982 > # bad: [54acd2dc52b069da59639eea0d0c92726f32fb01] mm/memblock: fix a typo in comment "implict"->"implicit" > git bisect bad 54acd2dc52b069da59639eea0d0c92726f32fb01 > # good: [784a17aa58a529b84f7cc50f351ed4acf3bd11f3] mm: remove the pgprot argument to __vmalloc > git bisect good 784a17aa58a529b84f7cc50f351ed4acf3bd11f3 > # good: [6cd8137ff37e9a37aee2d2a8889c8beb8eab192f] khugepaged: replace the usage of system(3) in the test > git bisect good 6cd8137ff37e9a37aee2d2a8889c8beb8eab192f > # bad: [6987da379826ed01b8a1cf046b67cc8cc10117cc] sparc: remove unnecessary includes > git bisect bad 6987da379826ed01b8a1cf046b67cc8cc10117cc > # good: [bc17b545388f64c09e83e367898e28f60277c584] mm/hugetlb: define a generic fallback for is_hugepage_only_range() > git bisect good bc17b545388f64c09e83e367898e28f60277c584 > # good: [9b5aa5b43f957f03a1f4a9aff5f7924e2ebbc011] arch-kmap_atomic-consolidate-duplicate-code-checkpatch-fixes > git bisect good 9b5aa5b43f957f03a1f4a9aff5f7924e2ebbc011 > # bad: [89194ba5ee31567eeee9c81101b334c8e3248198] arch/kmap: define kmap_atomic_prot() for all arch's > git bisect bad 89194ba5ee31567eeee9c81101b334c8e3248198 > # good: [022785d2bea99f8bc2a37b7b6c525eea26f6ac59] arch-kunmap_atomic-consolidate-duplicate-code-checkpatch-fixes > git bisect good 022785d2bea99f8bc2a37b7b6c525eea26f6ac59 > # good: [a13c2f39e3f0519ddee57d26cc66ec70e3546106] arch/kmap: don't hard code kmap_prot values > git bisect good a13c2f39e3f0519ddee57d26cc66ec70e3546106 > # first bad commit: [89194ba5ee31567eeee9c81101b334c8e3248198] arch/kmap: define kmap_atomic_prot() for all arch's > >
